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[KERNEL] [SM-T700 WIFI & T705 LTE] [02 Feb] SkyHigh TW Kernel [v2.7.0] [Synapse ++]

OP UpInTheAir

6th July 2014, 04:32 AM   |  #1  
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Thanks Meter: 6,042
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Join Date:Joined: Jan 2011
[KERNEL] [SM-T700 WIFI & T705 LTE] [02 Feb] SkyHigh TW Kernel [R4_v2.7.0] [Synapse ++]

8.4" SM-T700 WIFI & T705 LTE TW Exynos 5420 supported in thread only !!

I don't have time to build for any more devices I can't personally test & debug - sorry.

Let get it straight, I am not a real Developer, but I am UpInTheAir, former part time kernel hack of SM-N915S/T800/T805/N9005 LTE, SGT 7.7 JB & ICS Kernels. I now share with you my Exynos5 TW SM-T700 WIFI & SM-T705 LTE kernels compiled from official Samsung sources.

* I don't pretend to know everything, so if you can be constructive and help out this project, please do so. You will find allot of answers by searching gitHub, XDA and SEARCH Just like I do ......

>> SCREENSHOTS << from v0.5 : might not be always up-to-date !


* Based on official Samsung source: T705WVLU1ANJ5

* ramdisk source: T700XXU1ANL2 & T705XXU1AOA1

* Built with Stock ARM Toolchain 4.7

* Compiled with KERNEL_MODE_NEON & -mfpu=neon-vfpv4 + optimizations




* adb insecure

* ROM Knox disable/freeze via Synapse control

* init.d script support (drop in script & set permissions to 755 or 777 and reboot)

* busybox v1.22.0-Dream-IRC installed to /sbin

* Will NOT delete your WIFI settings & passwords

* Possible Screen Mirroring / AllShare Cast fix

* Synapse app support for almost all kernel configurations + more !!

Many descriptions are in the app ! If you require more info, don't be lazy, please SEARCH like I did !


  • CPU max frequency A15 cores = 2100 MHz (stock/default = 1900 MHz)
  • CPU min frequency A7 cores = 200 MHz (stock/default = 500 MHz)
  • Multi-core power saving control (sched_mc_power_savings)
  • Power-efficient Workqueues control
  • A15 big & A7 LITTLE Cores time in state

  • Voltage control for:
    big cores
    LITTLE cores

  • CPU governor
    interactive (default)
    on-demand (tweaked to use power efficient workqueues)
  • CPU governor tunables

  • CPU internal frequency voltage control (Stock 133-600 MHz)
    83-133 - 222 - 333 - 400 - 440 - 460 - 480 - 500 - 600
  • Memory frequency voltage control (stock 160-733 MHz)
    133-160 - 200 - 266 - 400 - 533 - 667 - 733 (1.9 GHz) - 800 (2.0 GHz) - 933 (2.1 GHz)

  • Midgard GPU power policy control
    coarse_demand (default)
    demand (stock)
  • Midgard GPU power policy threshold control (profiles)
    Battery (default)
  • GPU max frequency = 667 MHz (stock/default = 480 MHz)
  • GPU min frequency = 100 MHz (stock/default = 177 MHz)
  • GPU voltage control
  • GPU freq time in state

  • MScaling settings for:

  • I/O Schedulers
    BFQ (default - tweaked for SSD)
    DEADLINE (tweaked for SSD)
  • Int storage scheduler
  • Int storage read-ahead (512 KB for 16 GB partition)
  • General IO tuneables
  • I/O scheduler tunables

  • Kernel SamePage Merging (KSM)
    KSM stats
    Pages to Scan
    Scan delay interval
    Deferred Timer control
  • Dynamic Fsync control (default enabled)
  • Dynamic management of dirty page writebacks
  • Virtual Memory
    VNSWAP control
    ZSwap memory pool control
    Dirty Background Ratio
    Dirty Ratio
    Drop caches (Clear VFS cache after boot)
    Laptop Mode
    Adaptive VFS Cache Pressure on Suspend / Resume

  • PowerSuspend
    Hybrid_hook (default)
  • PowerSuspend State (only with Userspace_trigger)

  • Low Menory Killer Profiles
  • Low Memory Killer minfree tuning (OOM LMK)
  • Management of not killable processes whitelist
    system apps
    user apps
  • Entropy
  • Gentle Fair Sleepers control
  • Arch Power control (enabled)
  • randomize_va_space control

  • CPU thermal control
  • GPU thermal control
  • Memory interface thermal control


* WolfsonMicro Sound Control by AndreiLux
* parametric equalizer presets & tuning by heyjoe66
  • Mono mixer
  • Speaker amplification
    Left channel volume
    Right channel volume
    Earpiece volume
    Privacy mode
  • SP equalizer control
  • HP equalizer control

  • Battery info
  • Unstable power detection
  • AC mains
  • Standard downstream port
  • Dedicated charging port
  • Charging downstream port
  • Accessory charger adapter
  • Miscellaneous charging
  • MHL power
  • Battery Scaling Calibration (fuel-gauge chip reset)

  • TCP congestion control
    All available enabled.
    Default = westwood+
  • Screen mirror/allshare cast fix control (default = enabled)
  • Clean WIFI Lease
  • WiFi Power Mode While Screen-On/Off
    Force Off
    Fast (default = screen ON)
    Max (default = screen OFF)
  • WiFi DTIM Interval While Screen-On/Off
  • tcp_default_init_rwnd
  • TCP/IP network security
  • TCP/IP network speed (default = enabled)
  • 3G DNS speed & security tweak
    Google, OpenDNS, Comodo, Level3, Norton_DNS, Smart_Viper
  • GPS region TEMPORARY REMOVED IN v2.0.0
    Default, Asia, Europe, Oceania, North America, South America, Africa
  • IVP6 Optimistic Detection
    optimistic_dad (enabled)
    use_optimistic (enabled)

  • UMS (USB Mass Storage) mode
  • MTP mode
  • USB Keyboard / Mouse (with USB Keyboard app)

  • Restore - Delete - Backup

  • KNOX control (default "NO_ACTION")

  • Reboot device
  • Recovery Mode
  • Download Mode
  • Power Off
  • Clear Synapse Data
  • Restart Synapse

FS (File System)
  • Display FS Type
  • FS Controls
    remount System r/w r/o
    remount RootFS r/w r/o
  • Maintenence
    optimise databases (SQLite3)

  • Kernel SYSCTL
  • Net SYSCTL

  • Android logger control (disabled)
  • logcat
  • dmesg
  • last_kmsg


* xz kernel compression

* Reduced logging

* enable ARCH_POWER


* optimized SLUB memory allocator

* Frandom

* mount partitions NOATIME and NODIRATIME by default


* F2FS support in source and ramdisk (not tested)

* exFAT FS support

* NTFS R/W support with app

* CIFS support

* Asynchronous Fsync

* WIFI: filter multicast packages while suspended

* /proc/.config.gz support


* NVIDIA power efficiency patches

* Low Memory Killer tweaks

* Microsoft X-BOX gamepad controller in-built module

* And lots lots more ...................


* My family !!
* BeansTown106 & Chainfaire for bringing root
* halaszk88 - initial sysnapse layout & many source commits
* AndreiLux - many many contributions to Exynos kernel development & Synapse app
* apbaxel - various synapse controls I've adapted
* faux123 - various patches
* Yank555 - various patches
* heyjoe66 - Wolfson parametric equalizer presets & tuning
* Samsung OSRC
* and many others!
* check github source credits

XDA:DevDB Information
SM-T700 WIFI & T705 LTE TW Kernel, Kernel for the Samsung Galaxy Tab S

Source Code:

Kernel Special Features:

Version Information
Status: Stable
Current Stable Version: v2.6.0
Stable Release Date: 2015-01-30

Created 2014-07-06
Last Updated 2015-02-02
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Last edited by UpInTheAir; 9th October 2014 at 03:56 AM.
The Following 51 Users Say Thank You to UpInTheAir For This Useful Post: [ View ]
6th July 2014, 04:32 AM   |  #2  
OP Senior Member
Flag Phuket, Thailand
Thanks Meter: 6,042
5,185 posts
Join Date:Joined: Jan 2011
Database Requirements - installation & download


* Under-volting can cause instability

* Over-clocking can cause freeze/reboot, heat & damage to CPU, GPU or other hardware

* Any customizations may void warranty

* May not be suitable for your device or customizations

* UpInTheAir is NOT responsible, the person you see in the mirror is !


  1. Watch >> THIS <<
  2. SM-T700 WIFI or T705 LTE Exynos device
  3. TW Kit Kat 4.4.2
  4. Rooted
  5. TWRP Recovery


v2.7 [02-February-2015]

ramdisk :
  • init.rc: set optimistic DAD enabled
  • synapse: SYSCTL: add separate FS-KERNEL-NET-VM (if you don't understand what each does, don't touch)
  • synapse: ADVANCED: add Arch Power control (enabled)
  • synapse: NETWORK: add IVP6 Optimistic Detection (enabled)

kernel :
  • net: wireless: bcmdhd4358: reduce kernel logging
  • page_alloc: Make watermarks tunable separately
  • powersuspend: various patches/fixes
  • usb: gadget: check for accessory device before disconnecting HIDs
  • ipv6: clean up anycast when an interface is destroyed
  • xt_qtaguid: Use sk_callback_lock read locks before reading sk->sk_socket
  • ARM: compile KERNEL_MODE_NEON with -mfpu=neon-vfpv4
  • Makefile: various (experimental) kernel build optimizations
  • sched: Add controls for sched features
  • ARM: compile vfp with softfp

v2.6.0 [30-Jan-2015]

ramdisk :
  • synapse: NETWORK: FIX apply/discard bug for TCP speed/security & 3G DNS tweaks
  • synapse: NETWORK: add Screen mirror/allshare cast fix control
  • Synapse: NETWORK: add Clean WIFI Lease
  • synapse: NETWORK: set TCP/IP Network Speed tweak "Enabled" by default
  • Synapse: ADVANCED: add LMK profiles
  • Synapse: MEMORY: add KSM stats
  • Synapse: MEMORY: add Drop caches (default enabled)
  • Synapse: BATTERY: add battery scaling re-calibration instructions

kernel :
  • arch: arm: lib: optimize memcpy for cortex-A15
  • Revert "BCMDHD4354: WIFI: POWERSUSPEND support (not using with panel on/off powersuspend hooks)

v2.5.0 [23-Jan-2015]

ramdisk :
  • T700XXU1ANL2 & T705XXU1AOA1 ramdisk
  • synapse: GPU QoS: add GPU QoS controls for: MIF, INT, CPU
  • synapse: AUDIO: add controls for speaker amplification & equalizer
  • ramdisk: /sbin/ add Wolfson sound defaults (parametric equalizer presets & tuning by heyjoe66)

kernel :
  • sched: Implement smarter wake-affine logic
  • cpufreq: interactive: decrease timer_slack to 70ms
  • kernel/power/powersuspend: add display panel hooks for powersuspend
  • kernel/power/powersuspend: add missing version numbers
  • wolfson sound control: Fixed stereo EQ and DRC for headphones and speakers
  • byteorder: allow arch to opt to use GCC intrinsics for byteswapping
  • CPU unaligned access path
  • Makefile: enable unaligned access
  • fs/dcache.c: Fix the too small buffer for dname
  • GPU: add interface to modify GPU governor scaling table for MIF/INT/CPU QoS freq
  • Makefile: fix compile error
  • devfreq: INT: unlock 83 MHz min freq
  • devfreq: MIF: unlock 133 MHz min freq

v2.4.0 [17-Jan-2015]

ramdisk :
  • synapse: GPU: FIX GPU governor not setting on reboot
  • synapse: MEMORY: update Dynamic Dirty Page Writeback description

kernel :
  • cpufreq: interactive: use new CPUFREQ_RELATION_C
  • fs: vfat: reduce the worst case latencies
  • config: enable XPAD support (Microsoft X-BOX gamepad)
  • mm: pass readahead info down to the i/o scheduler

v2.3.0 [12-Jan-2015]

ramdisk :
  • /sbin/ add NTFS r/o mounting (/mnt/ntfs/). For r/w, use paragon app.

kernel :
  • block: sysfs: allow non superusers to change I/O scheduler
  • Fix dynamic read-ahead
  • binfmt_elf.c: use get_random_int() to fix entropy depleting (max = 4096)
  • android: lowmemorykiller: add lmk parameters tunning code
  • lowmemorykiller: Account for highmem during kswapd reclaim
  • cpufreq: interactive: don't skip waking up speedchange_task if target_freq > policy->cur
  • omdemand: lower down_step_level to 100 (aka 200) MHz
  • cpufreq: Introduce new relation for freq selection
  • Squash 'enhance power efficiency' patches
  • vfs: fix bad hashing of dentries
  • selinux: whitelist f2fs
  • SELinux: Fix memory leak upon loading policy
  • selinux: just shut up
  • selinux: fix inode security list corruption
  • fs: Add a missing permission check to do_umount
  • kernel: add support for gcc 5
  • crypto: create generic version of ablk_helper
  • ARM: pull in <asm/simd.h> from asm-generic
  • crypto: sha1: add ARM NEON implementation
  • config: CRYPTO_SHA1_ARM_NEON
  • crypto: ablk_helper - Replace memcpy with struct assignment
  • crypto: add crypto_[un]register_shashes for [un]registering multiple shash entries at once
  • crypto: sha256 - Expose SHA256 generic routine to be callable externally
  • crypto: sha512 - Expose generic sha512 routine to be callable from other modules
  • ARM: 8120/1: crypto: sha512: add ARM NEON implementation
  • config: enable CRYPTO_SHA512 & CRYPTO_SHA512_ARM_NEON
  • ARM: 7723/1: crypto: sha1-armv4-large.S: fix SP handling
  • board-lt03-battery: Longer battery polling interval

v2.2.0 [24-Dec-2014]

ramdisk :
  • init.rc: set GPU governor course_demand (set as default)
  • Synapse: GPU: add Midgard GPU power policy control
  • Synapse: GPU: add Midgard GPU power policy threshold control (set default profile "Battery")
  • Synapse: NETWORK: add 3G DNS speed & security tweak
  • Synapse: Some more clean up

kernel :
  • usb: gadget: mass_storage: added sysfs entry for cdrom to LUNs
  • Mali: proper GOV table on init; code cleanup

v2.1.0 [21-Dec-2014]

ramdisk :
  • FIXED CIFS: init.rc: Create mountpoint so Dalvik can mark as slave in zygotes to allow CIFS mounting and other app databases (forgot to include when updated ramdisk)
  • FIXED slow Synapse load on boot: KNOX: please set to "NO_ACTION" after set Disabled or Enabled. Knox will still be enabled or disabled.
  • Synapse: Lots of clean up of code and remnants of old files
  • Synapse: Tidy up of layout, added/remove/move tabs and features about
  • Synapse: CPU: added big.LITTLE CPU freq time in state
  • Synapse: GPU: added GPU freq time in state
  • Synapse: IO: added IO scheduler tunables
  • Synapse: BATTERY: added more info
  • Synapse: REBOOT: added Restart Synapse button
  • Synapse: INFO: added asv_group
  • Synapse: NETWORK: add TCP security
  • Synapse: NETWORK: add TCP speed

v2.0.0 [27-Nov-2014]

updater-script :
  • Removed ROM KNOX removal code (Synapse freeze/disable in Synapse control added)

ramdisk :
  • ramdisks from T700XXU1ANJ4 & T705XXU1ANJ3
  • init.rc/default.prop: removed SELinux permissive hack, now set in source
  • Synapse: Security: add KNOX enable/disable (freeze) control
  • Synapse: CPU: Power-efficient Workqueues control (default enabled)
  • Synapse: USB: remove storage options (temporary until fixed)
  • Synapse: Network: remove GPS tweak options - slowing down boot (temporary until fixed)
  • Synapse: various small tidy up and additions

kernel :
  • source update: T705WVLU1ANJ5
  • SELinux: set permissive in source instead of ramdisk

v1.9.1 [07-Oct-2014]

ramdisk :
  • synapse: FS: bug fix - Optimise Databases error if no sdcard/SkyHigh/Log folder not present

v1.9 [06-Oct-2014]

ramdisk :
  • init.rc: remove Gentle Fair Sleepers boot default - now disabled by default in source
  • synapse: Backup Restore: fixed bug not backing up & restore current kernel
  • synapse: FS: add push button to Optimise Databases (SQLite3)

kernel :
  • xz: tweaking kernel compression
  • af_unix: speedup /proc/net/unix
  • sched: disable GENTLE_FAIR_SLEEPERS by default
  • mm: don't wait for congestion when mem is high
  • block: disable add_random for more performance on SSD's
  • fs/dyn_sync_cntrl: on by default if enabled in defconfig
  • mmc: disable CRC check for better performance
  • mm: optimize Kernel Samepage Merging (KSM)
  • Input: send events one packet at a time
  • lib/int_sqrt.c: optimize square root algorithm
  • readahead: make context readahead more conservative
  • gpu: ion: system_heap: add support for 2MB allocations
  • CHROMIUM: clocksource: allow clocksources to be selected earlier during boot

v1.8 [30-Sept-2014]

ramdisk :
  • init.rc: Create mountpoint so Dalvik can mark as slave in zygotes to allow CIFS mounting and other app databases.
  • synapse: USB: add MTP mount option (if is doesn't mount storage properly on PC, just toggle between Default > MTP )
  • synapse: INT/MIF voltage control

kernel :
  • EXYNOS5420 MIF: unlock MIF 933 MHz & set for CPU 2.0+ GHz freq
  • opp: De-obscurify OPP structs and disclose find_device_opp
  • devfreq: add Exynos 5420 MIF voltage control
  • devfreq: add Exynos 5420 INT voltage control
  • MIF / INT fix
  • MIF / INT: allow 6250 mV increments
  • EXYNOS5420 MIF: set 800 MHz for CPU 2.0 GHz freq
  • workqueue: fix permission for power_efficient

v1.7 [21-Sept-2014]

kernel :
  • arch/arm/Makefile: adaptation to full neon-vfpv4 support
  • sched: GENTLE_FAIR_SLEEPERS fix unused cpu var
  • drivers/staging: configurable android log buffer sizes
  • config: set LOGCAT_SIZE=256
  • ext4: Speedup WB_SYNC_ALL pass called from sync(2)
  • bfq-iosched: tuning for SSD
  • ksm: check and skip page, if it is already scanned
  • config: enable KSM_CHECK_PAGE
  • config: enable Conservative & disable Userspace governor

v1.6 [17-Sept-2014]

ramdisk :
  • init.rc: set defaults: removed KSM deferred_timer as now set enabled in source
  • synapse: Network: tcp_default_init_rwnd (not sure how to tune the value yet)
  • synapse: Reboot: added Power Off option

kernel :
  • cifs: enable mounting cifs drives visible to all apps
  • block: Reserve only one queue tag for sync IO if only 3 tags are available
  • setlocalversion: do not append -dirty when there are un-committed changes
  • kswapd: reduce time spent in congestion_wait
  • workqueue: add system wide power_efficient workqueues (battery)
  • config: enable WQ_POWER_EFFICIENT (battery)
  • CPUFREQ: ondemand: use power efficient wq (battery)
  • mutex: Make more scalable by doing less atomic operations
  • mutex: Queue mutex spinners with MCS lock to reduce cacheline contention
  • writeback: fix writeback cache thrashing
  • sched: Make scheduler aware of cpu frequency state
  • bcmdhd4354: filter multicast packages while suspended (battery)
  • tcp: add a sysctl to config the tcp_default_init_rwnd
  • net: tcp: optimization with rcv_wnd
  • vfp/Makefile: compile with -mfpu=neon-vfpv4 & hard float
  • slub: optimized SLUB memory allocator
  • net: loopback: set default mtu to 64K
  • ksm: enable deferred_timer by default to prevent the CPU to be wakened for ksm activities
  • ext4: add support for FIDTRIM, a best-effort ioctl for deep discard trim (no idea if it's working)
  • Report permissive mode in avc: denied messages
  • config: disable mutex debugging

v1.5 [10-Sept-2014]

ramdisk :
  • init.rc: set defaults: Dynamic FSync enabled

kernel :
  • ARM: implement KERNEL_MODE_NEON
  • config: enable KERNEL_MODE_NEON
  • Makefile: added ccache for speed up kernel compile
  • sync: don't block the flusher thread waiting on IO
  • staging: android: lowmemorykiller: select a new task to kill
  • SELinux: Reduce overhead of mls_level_isvalid() function call
  • SELinux: Fix kernel BUG on empty security contexts
  • fix compile warning for Async Fsync
  • arm/crypto: add optimized AES and SHA1 routines
  • config: enable CRYPTO_SHA1_ARM & CRYPTO_AES_ARM
  • softirq: reduce latencies
  • ext4: speed up truncate/unlink by not using bforget() unless needed
  • mm: Clear page active before releasing pages

v1.4 [07-Sept-2014]

ramdisk :
  • synapse: Memory: VNSWAP control (1>1024 MB - Unable to disable (reset) / set size to 0 yet)
  • synapse: Memory: ZSwap memory pool control
  • synapse: Memory: Deferred Timer control
  • synapse: minor typo, cleanup & corrections to general layout and descriptions

kernel :
  • ksm: Provide support to use deferred timers for scanner thread
  • sched: LOAD_FREQ (4*HZ+122) avoids loadavg Moire
  • staging: android: lowmemorykiller: implement task's adj rbtree
  • config: enable ANDROID_LMK_ADJ_RBTREE
  • cpufreq: tidy up
  • block: add SIO I/O scheduler
  • block: add ZEN I/O scheduler
  • config: enable SIO & ZEN I/O schedulers

v1.3 [03-Sept-2014]

ramdisk :
  • synapse: Reboot: added Reboot to Download Mode
  • synapse: USB: USB Mouse / Keyboard control
  • ramdisk: file_contexts: add busybox to file_contexts to allow via SELinux

kernel :
  • cpufreq: Fake the IKS specific frequency table to stock values (fixes: corrects to stock CPU touch boost frequencies & CPU freq in Power Saving Mode)
  • lib: memcopy & string use glibc version
  • scheduler: update BFQ-v7r4 to BFQ-v7r5 for 3.4.0
  • drivers: usb: Use Android device as USB keyboard/mouse
  • USB KEYBOARD/MOUSE: added on/off trigger to driver

v1.2 [01-Sept-2014]

ramdisk :
  • synapse: Network: WiFi Power Mode controls

kernel :
  • BCMDHD4354: WIFI PM support for KitKat driver
  • sched: cpu_power: enable ARCH_POWER

v1.1 [31-August-2014]

ramdisk :
  • init.rc: added some more boot defaults
  • synapse: new PowerSuspend controls: (enabled Hybrid as default)

kernel :
  • kernel/power/powersuspend: cumulative update to version 1.5
  • kernel/power/powersuspend: LCD screen on/off hooks

v1.0 [27-August-2014]

ramdisk :
  • default.prop: Possible Screen Mirroring / AllShare Cast fix (please give FULL report !!)
  • init.rc: added some more boot defaults
  • synapse: added to descriptions & general clean up
  • synapse: PowerSuspend: (enabled by default)
    added dynamic Fsync control (disabled by default)
    moved Dynamic Dirty Page Writeback controls
    added Adaptive VFS Cache Pressure on Suspend / Resume
  • synapse: Battery: added Battery Scaling Calibration (fuel-gauge chip reset)
  • synapse: Reboot: added Clear Synapse Data button

kernel :
  • fs/dyn_sync_cntrl: dynamic Fsync control v1.5
  • fs/dcache.c: adaptive vfs_cache_pressure on suspend / resume
  • fs/aio.c: Asynchronous I/O latency to a solid-state disk greatly increased
  • enabled AIO
  • kernel: sched: LOAD_FREQ (4*HZ+61) avoids loadavg Moire
  • config: set default TCP Westwood+ -- remembered at last :)
  • Dynamic read-ahead (1024 kB for 16 GB partition)
  • block: add FIOPS I/O scheduler
  • block: deadline: tweaks
    Optimize for non-rotational
    allow 0ms deadline latency, increase the read speed

v0.9 [22-August-2014]

updater-script :
  • Knox removal

ramdisk :
  • T700: new T700KXU1ANG1 ramdisk (thanks @stitoo )
  • init.rc: added some more boot defaults
  • synapse: Audio: removed Main Speaker amplification & equalizer (only top speaker was boosted)
  • synapse: Drivers: added PowerSuspend control
  • synapse: Memory: added Dynamic Dirty Page Writeback controls
  • synapse: Advanced: added LMK Whitelist control for Do-Not-Kill Processes
  • synapse: various small cleanups
  • init.universal5420.rc: mount F2FS

kernel :
  • Completely rebuilt on newer T700OPU1ANG2 source
  • removed GPU 733 MHz freq step. Max now at 667 MHz (optional)
  • kernel/power/powersuspend: new PM kernel driver for Android w/o earlysuspend v1.2
  • staging: android: lowmemorykiller: Management of not killable processes (read Post #3 )
  • mm: Dynamic management of dirty page writebacks
  • config: enable LAST_KMSG
  • Asynchronous Fsync: initial extraction of Async Fsync from HTC
  • FS: import F2FS

v0.7 [16-August-2014]

ramdisk :
  • T700: new ramdisk from T700XXU1ANF9 (thanks @mitchellvii )
  • T705: new ramdisk from T705XXU1ANG2 (thanks @edan1979 )
  • synapse: Reboot: added reboot & recovery options
  • synapse: removed Audio checkboxes to enable speaker & headphone equalizer settings (enabled by default)

kernel :
  • Completely rebuilt on newer T700XXU1ANF7 source
  • added GPU 733 MHz freq step (optional) will decrease benchmark due to thermal throttle, but what the heck !
  • MALI_DVFS-START FEQ set to 100 MHz (will allow launcher to idel lower & use loads more of user set min GPU freq )
  • Kernel compression mode changed to XZ (smaller zImage & stops kernel flash damaging the Recovery partition )
  • removed useless CPU Performance governor

v0.6 [12-July-2014]

ramdisk :
  • synapse: Network: TCP/IP network security
  • synapse: Network: TCP/IP network speed
  • synapse: Network: GPS region
  • synapse: USB: UMS (USB Mass Storage) mode

v0.5 [11-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: adjustments to various layout options and info
  • synapse: audio controls (some omitted for now)

kernel :
  • WolfsonMicro WM5102 sound control by AndreiLux

v0.4 [10-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: adjustments to various layout options and info
  • synapse: CPU: multi-core power saving control (sched_mc_power_savings)
  • synapse: Advanced: randomize_va_space control
  • /sbin/ enable frandom & fix init.d

kernel :
  • add frandom
  • fs: mount partitions NOATIME and NODIRATIME by default
  • BFQ-v7r4 IO scheduler & set as default)
  • config: enable sched_mc_power_savings for sysfs

v0.3 [09-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: add various layout options and info
  • synapse: CPU general IO tuneable
  • synapse: Virtual memory tuneable
  • synapse: Gentle fair sleepers control (disabled to improve UI performance)
  • synapse: TCP congestion control
  • synapse: Android logger control (disabled)
  • synapse: logs - last_kmsg

kernel :
  • logger: modify for Synapse app checkbox compatibility
  • add sysfs interface for GENTLE_FAIR_SLEEPERS

v0.2 [07-July-2014]

ramdisk :
  • init.rc: set some Synapse boot defaults
  • synapse: add GPU, battery & thermal controls

kernel :
  • cpufreq: allow A15's to 2.1 GHz and A7's to 200 MHz
  • config: enable TCP congestion control & all available algorithms
  • logger: add sysfs interface to enable / disable Android Logger
  • battery: add MAX77803/UNIVERSAL5420 charger control
  • battery: add unstable power detection switch to charger controls
  • battery: properly populate current now, avg, and max output properties
  • battery: expose all MHL currents in charger controls
  • Mali GPU: OC to 677 & UC to 100 MHz
  • Mali GPU: clock & governor control
  • Mali GPU: voltage control
  • mach-exynos: lower regulator buck min voltages
  • exynos_tmu: add configurable interface

Initial Release v0.1 [06-July-2014]

ramdisk :
  • default.prop/init.rc: adb insecure, wifi fix & SELinux permissive
  • add synapse support (initial files ported from halask88 & moddified to suit)

kernel :
  • config: enable /proc/.config.gz support
  • config: enable KSM support
  • config: enable performance CPU governor
  • config: enable USB OTG support
  • config: enable NTFS RW support
  • config: enable CIFS support
  • config: disable DEBUG_INFO
  • add sysfs helpers
  • cpufreq: add Exynos 5420 voltage control


  1. Watch >> THIS <<
  2. Uninstall any CPU control apps, tweaks and scripts etc.
  3. Recommend: Install Wanam DVFS disabler for greater kernel control
  4. Recommend: Backup your current kernel with TWRP Recovery
  5. Recommend: Install Synapse app from Google Play and rate it ☆☆☆☆☆ !!
  6. If Synapse app is installed and using with any current kernel: device settings > applications > synapse > FORCE STOP & CLEAR DATA
  7. Flash SKyHigh kernel with CWM or TWRP Recovery
  8. After boot (wait at least 60-120 secs)
  9. Open Synapse
  10. Tap "Understood"
  11. Make any change, and tap the "" to apply new defaults
  12. After setting and applying any GPU freq changes, don't forget to tap [Apply GPU Governor Settings] in Synapse GPU section
  13. Any issues, please check Posts #1-3 and search the thread BEFORE posting



>> WIFI SkyHigh T700 WIFI kernel <<

STOCK T700 WIFI T700XXU1ANJ4 kernel (Flashing Stock will wipe your WiFi settings !)



>> LTE SkyHigh T705 LTE kernel <<

STOCK T705 LTE T705XXU1ANJ3 kernel (Flashing Stock will wipe your WiFi settings !)


>> github <<

Last edited by UpInTheAir; 2nd February 2015 at 10:25 AM.
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6th July 2014, 04:32 AM   |  #3  
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Question HELP & FAQ


  1. [Q] Synapse: AUDIO: HP equalizer does not work
    [A] Toggle the control switch off > apply > on > apply
  2. [Q] GPU Qos has this error:
    [A] Don't worry, it will only show if GPU freq 100 MHz is not in use. If you set 100 MHz and restart synapse, control will be available without error.


If you don't like the sound:
  1. open synapse app
  2. AUDIO: set all SP equalizer settings to zero
  3. disable SP equalizer
  4. apply


  1. Wait for the kernel to stabilize and device to cool
  2. Open synapse app
  3. Synapse app menu > select all globally > undo > apply
  4. Re-boot
  5. If still issues > try again after #1
  6. Still issues > Manually set config after boot (open synapse app > syanapse app menu > settings > disable apply on boot)


  1. Uninstall any CPU control apps, tweaks and scripts etc.
  2. Install Wanam DVFS disabler for greater kernel control
  3. Flash kernel
  4. Boot and allow things to stabilize
  5. Open Synapse & tap :
    "understood" message about unstable boot
    "select all globally"
    "undo" button
  6. Reboot and ensure "synapse boot completed" toast message
  7. You should be good to go


  1. Power off & let device cool
  2. Wipe cache & dalvik-cache in recovery (if custom recovery)
  3. Re-flash kernel
  4. Re-boot
  5. Let things stabilize and cool before touching anything


  1. There are no best settings. User "HABIT" is #1 cause of battery drain, followed by screen, ROM & apps, modem etc
  2. This kernel is built to be balanced with a good mix of battery whilst keeping performance
  • Decrease screen brightness
  • Use dark wallpapers and app themes
  • Check your wakelocks with better battery stats app & use Greenify app to stop unwanted apps self starting and running in the background
  • Suggest:
    CPU GOV: governor = ondemand (tweaked for power efficient workqueues)
    CPU FREQ: 200-1900 MHz (-25 mV)
    GPU: 100-480 MHz (-50 mV) (100 MHz may induce some GUI sluggishness)
    GPU: Midgard Power policy control = coarse_demand
    GPU: Midgard Power policy threshold control = Battery
    PowerSuspend Driver = Enable
    MEMORY: Dynamic FSync = Enable
    MEMORY: Dirty Page Writeback = Enable
    CPU Multicore Power Saving = (2) Agressive


  • Synapse: GPU: Set Midgard Power policy threshold profile to Ondemand or Performance. This will scale your GPU up/down faster at the expensive of battery life compared to Battery profile.
  • Disable DVFS with [APP][Android 4.0+][DVFS Disabler]
  • Warmer device under heavy load, but within the safe CPU temp of 95 degC


  • Set Midgard Power policy threshold profile (This determine how your GPU freq scales up/down):
    Battery = battery friendly
    Ondemand = Good all-round mix
    Performance = A little agressive
  • Method:
    1. Ensure you apply [] any changes to MIN / MAX GPU freq or GPU GOV Threshold profile
    2. PRESS THE "Apply GPU GOV SETTINGS" button !!
    3. Settings will be applied immediately and auto set on every boot.


  • Boot into TWRP Recovery
  • Select Backup
  • Select "[X] Boot" only (boot.img/kernel)
  • Select Storage > Micro SD (if external sdcard installed) > OK
  • Swipe to backup


  • No, many features and options won't be available. Remove all other control apps to avoid conflicts !
  • Synapse is the recommended and has everything you need


  • CPU load & freq - available RAM - GPU freq - CPU temp - most resource intensive process
  • [APP][2.1+] Cool Tool
  • Download my personal cooltool_presets > unzip & copy folder to INTERNAL sdcard. If you have cool tool app already running, you must disable > overwrite existing folder > enable


  • Real frequency is apparently double that reported by other apps
  • Example: min 200 MHz (real) in Synapse is reported as 100 MHz in SetCPU


  1. Don't UV or UC CPU or GPU
  2. Use SkyHigh defaults


  1. I want to keep this project all in one place (Thanks to XDA) - ☆☆ NO MIRRORS ☆☆
  2. Please try again in a few minutes


  1. Allow the device to cool. Repetitive testing will heat the device hardware and invoke thermal throttling and lead to decreased benchmark.
  2. HIGH CPU/GPU OC >> excessive heat >> thermal throttling >> reduced clock frequency >> DECREASE PERFORMANCE


  1. This feature allows the user to define processes and system processes white-lists filled with the preferred process names and to not be killed by lowmemorykiller, unless it is absolutely necessary.
  2. When a the lowmemorykiller needs to free ram, it will first kill the processes not included inside the two process name lists chosen by the user.
  3. If there are no more standard killable processes, then it will be necessary to kill one of the processes included inside one of the two white-lists, to prevent system hangs, slowdowns, etc.
  4. You can find the [SkyHigh/Synapse] folder on your internal sdcard and add one process name per line. Lists updated on reboot.
  5. Max 25 processes
  6. Example only:


* [Christopher83]


This feature allows to have two different intervals for dirty page
writebacks and to dynamically manage them when the system has been
resumed (it's active) or when has been suspended.

Three new procfs parameters are exposed inside /proc/sys/vm path:
- dynamic_dirty_writeback is the activation status of this feature,
set 1 to enable it, set 0 to disable it and use the standard behaviour
- dirty_writeback_active_centisecs is the interval for the dirty page
writebacks when the system is active (screen on)
- dirty_writeback_suspend_centisecs is the interval for the dirty page
writebacks when the system is suspended (screen off)

This feature is in part inspired on Francisco Franco's patch:


  1. If the backup isn't visible, reboot device and ensure for have "synapse boot completed" message. Otherwise synapse won't read the file.
  2. Reboot after applying your new settings


* Thanks to zeppelinrox & V6SuperCharger
  1. Hardening the TCP/IP stack to SYN attack
  2. Bump up tw_buckets in case we get DoS'd
  3. Ignore pings
  4. Don't cache connection metrics from previous connection
  5. Don't pass traffic between networks or act as a router
  6. Enable spoofing protection (turn on reverse packet filtering)
  7. Don't accept source routing
  8. Don't accept redirects
- Further reading:


  1. I don't believe it's kernel related, but rather busybox
  2. Try uninstall your ROM busybox with this app. and reboot.
  3. Re-flash kernel
  4. Use the busybox that comes with the kernel located in /sbin
  5. Also try to update your SuperSu and su binary if it asks and reboot.



  1. Tap [Fuel-Gauge reset] in synapse BATTERY section
  2. Reboot device
  3. Battery % "reporting" calibration (digital)
    a) Deplete battery to 5-10% (NOT ZERO)
    b) Charge UNINTERUPTED until FULL (don't touch)
    c) Unplug and then use normally. Device should then re-calibrate itself

Last edited by UpInTheAir; 25th January 2015 at 02:34 AM.
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6th July 2014, 05:25 AM   |  #4  
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Location v0.1 released
v0.1 is now released

Change-log in Post #2.

NOTE: commit credits are in source.

Further instructions in Synapse app & Posts #1-3




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6th July 2014, 07:50 AM   |  #5  
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It would appear most persons here have the sm-t800, the 10.5 with exynox cpu. Sorry I can't test your kernel though, wish I had synapse to configure my display.

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6th July 2014, 08:12 AM   |  #6  
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Originally Posted by toyanucci

It would appear most persons here have the sm-t800, the 10.5 with exynox cpu. Sorry I can't test your kernel though, wish I had synapse to configure my display.

Sent from my SM-T800 using Tapatalk

True. Another tab s 10.5 here. Hope to see the 10.5 one soon.
6th July 2014, 12:32 PM   |  #7  
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Have CPU OC to 2.1 GHz & UC to 200 MHz (read as 100 in most CPU control apps) working for next release.

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6th July 2014, 01:52 PM   |  #8  
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I recommend that you put THIS IS FOR THE LTE MODEL ONLY! in flaming giant red letters to save the flash happy noobs from causing themselves trouble. You mentioned it but you know these guys never read the OP. ☺
Last edited by mitchellvii; 6th July 2014 at 01:55 PM.
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6th July 2014, 02:26 PM   |  #9  
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Originally Posted by mitchellvii

I recommend that you put THIS IS FOR THE LTE MODEL ONLY! in flaming giant red letters to save the flash happy noobs from causing themselves trouble. You mentioned it but you know these guys never read the OP. ☺

You're probably right. Will do later, but they'll still miss it. ......

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6th July 2014, 03:44 PM   |  #10  
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I thought the lte model uses the snapdragon processor

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