Unofficial Android 4.4 Lands on Three Mediatek Devices

For the last few years, devices with MTK systems-on-chip haven’t received much … more

MultiImagePicker Library for Multiple Image Selection

App developmentcan be done in more than a handful of ways. You can write every single … more

Shoot Troubles, Not Users w/ Alex Boag-Munroe – XDA:DevCon 2014

In presenting the various sessions from XDA:DevCon 2014, weve mainly … more

Oppo Releases ColorOS for the Find 5… Poorly

Almost every OEM has taken the liberty of creating its own incarnation of the Android OS. … more

Welcome to XDA

Search to go directly to your device's forum

Register an account

Unlock full posting privileges

Ask a question

No registration required
Post Reply

Help with Audio Mod... [Need help from an Android Dev]

OP Meltus

16th August 2010, 06:03 PM   |  #1  
Meltus's Avatar
OP Senior Member
Flag Manchester
Thanks Meter: 1,015
 
1,911 posts
Join Date:Joined: Jan 2009
Donate to Me
More
Ok, basically my linux knowledge is very limited and i need help modifying a file that gets written on boot (i don't know if this would even work, so if someone could answer that it would be very much appreciated).

The file i'm looking to change is '/sys/module/q6audio/parameters/speaker_max_gain'. In the latest 2.1 build this file is set to '602', which i think explains the slight volume increase from 1.6 (it was set to '600', but located in 'sys/module/msm8k_cad_volume/parameters/handset_max_gain' instead)

So, does anyone know how to alter this file? I know it gets re-written every time you boot the phone, but i can't find where it's being written from. Is it a kernel thing or am I completely wasting my time with this?

Cheers
Last edited by Meltus; 17th August 2010 at 12:01 AM.
17th August 2010, 05:27 PM   |  #2  
Meltus's Avatar
OP Senior Member
Flag Manchester
Thanks Meter: 1,015
 
1,911 posts
Join Date:Joined: Jan 2009
Donate to Me
More
UPDATE - Thanks to @VogelDerNacht, i've tried a few things like trying to change the value in the init.rc (echo "value" > sys/module/q6audio/parameters/speaker_max_gain) which didn't work, and i then tried to use a sysctl.conf in /system/etc/ to do the same thing, which also didn't work (don't think the kernel supports this), so now i'm pretty stuck
It seems like i may have to wait for the kernel source to be release now ><
18th August 2010, 09:16 PM   |  #3  
Senior Member
Flag Durham, Uk
Thanks Meter: 832
 
1,152 posts
Join Date:Joined: Apr 2007
Donate to Me
More
how about creating a simple shell script and having it execute as a service from one of the init scripts ?

its possible the sys entry is not created until later in the boot sequence
19th August 2010, 02:17 PM   |  #4  
Meltus's Avatar
OP Senior Member
Flag Manchester
Thanks Meter: 1,015
 
1,911 posts
Join Date:Joined: Jan 2009
Donate to Me
More
Quote:
Originally Posted by DJ_Steve

how about creating a simple shell script and having it execute as a service from one of the init scripts ?

its possible the sys entry is not created until later in the boot sequence

could you give me an example please? i'm pretty new to all this linux stuff

The problem seems to be that when i add the line in to the init.rc (or any of the init files) it gets overridden by something else (probably the kernel) and i can't get it to apply my changes. I can change it fine whilst the phone is running, but that doesn't do anything because i think these files only get read from once when the phone boots.
I could be completely wrong though, like i said, my linux knowledge is pretty bad ><
19th August 2010, 02:30 PM   |  #5  
Senior Member
Flag Durham, Uk
Thanks Meter: 832
 
1,152 posts
Join Date:Joined: Apr 2007
Donate to Me
More
First you need to confirm that entry boosts what you want
19th August 2010, 10:21 PM   |  #6  
Meltus's Avatar
OP Senior Member
Flag Manchester
Thanks Meter: 1,015
 
1,911 posts
Join Date:Joined: Jan 2009
Donate to Me
More
Quote:
Originally Posted by DJ_Steve

First you need to confirm that entry boosts what you want

That's the problem. I think it reads from the file only once when the phone boots but i don't know, that's why i want to change it on boot to see if it works
19th August 2010, 10:25 PM   |  #7  
Senior Member
Flag Durham, Uk
Thanks Meter: 832
 
1,152 posts
Join Date:Joined: Apr 2007
Donate to Me
More
their should be a simple script (.sh extension) in /system/etc that you may be able to edit to add echo *your value > sys path to end of
19th August 2010, 11:10 PM   |  #8  
Meltus's Avatar
OP Senior Member
Flag Manchester
Thanks Meter: 1,015
 
1,911 posts
Join Date:Joined: Jan 2009
Donate to Me
More
Quote:
Originally Posted by DJ_Steve

their should be a simple script (.sh extension) in /system/etc that you may be able to edit to add echo *your value > sys path to end of

Tried that. Tired editing the init.rc, that didn't help. I tried adding a sysctl.conf but i don't think the kernel supports it. I tried editing every .sh file i could find but it looks like the kernel just overwrites everything
20th August 2010, 03:07 PM   |  #9  
Senior Member
Flag Durham, Uk
Thanks Meter: 832
 
1,152 posts
Join Date:Joined: Apr 2007
Donate to Me
More
ok if you fancy a hand trying to get the volume to boost drop me a pm as i woudln mind being a tester ffor playing with werid options (and since iport android anyway i know my way around

Post Reply Subscribe to Thread
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes