[Kernel][Stock1.3][Already included in CM7] Dalingrin's OC kernel [09/01/11]

harpo1 · Jul 1, 2011

nice job. UVing at -25mv on all steps. Will continue to adjust until nook becomes unstable then back it off a bit.

dalingrin · Jul 1, 2011

Hope the voltage control part of the app is not too hard to use. I didn't really like using the context menu to apply the settings and such.

You have to hit "apply" in order for the settings to be pushed to the kernel. This will also save them in a database. Then you can select "set on boot" to have those settings from the database applied on every boot.

newellj79 · Jul 1, 2011

Be interesting to know how far people can undervolt stabilized at certain frequencies. Please post results.

harpo1 · Jul 1, 2011

dalingrin said:
Hope the voltage control part of the app is not too hard to use. I didn't really like using the context menu to apply the settings and such.

You have to hit "apply" in order for the settings to be pushed to the kernel. This will also save them in a database. Then you can select "set on boot" to have those settings from the database applied on every boot.

Thanks didn't push the menu button and see the apply button. It's similar to other voltage control apps I use on my android phones. I usually mess with the voltages until I get them where I like them then set on boot.

I do have a request. Is it possible to add a wipe voltage setting in CWM? I know on my captivate some kernel devs have it and it makes it nice if you have bootloops or crashes.

For OC settings should I set on boot in your app, settings menu or both?

dalingrin · Jul 1, 2011

harpo1 said:
Thanks didn't push the menu button and see the apply button. It's similar to other voltage control apps I use on my android phones. I usually mess with the voltages until I get them where I like them then set on boot.

I do have a request. Is it possible to add a wipe voltage setting in CWM? I know on my captivate some kernel devs have it and it makes it nice if you have bootloops or crashes.

For OC settings should I set on boot in your app, settings menu or both?

No this is not possible or at least not as easily done in CWM because I am not applying the voltages in early boot.
Since the voltages are not applied until boot up is completely finished there is a fairly easy workaround if you mess up your voltage settings. Worst case scenario you can just run "adb uninstall com.dalingrin.nookcolortweaks" while the CM7 boot animation is going.

harpo1 · Jul 1, 2011

dalingrin said:
No this is not possible or at least not as easily done in CWM because I am not applying the voltages in early boot.
Since the voltages are not applied until boot up is completely finished there is a fairly easy workaround if you mess up your voltage settings. Worst case scenario you can just run "adb uninstall com.dalingrin.nookcolortweaks" while the CM7 boot animation is going.

Thanks that seems easy enough.

One last question. Should set on boot be performed from your app, the menu settings or both?

dalingrin · Jul 1, 2011

harpo1 said:
Thanks that seems easy enough.

One last question. Should set on boot be performed from your app, the menu settings or both?

Both, because they change different things. I know its confusing and its made me think about adding the functionality to Nook Color Tweaks but then the two could potentially conflict with each other adding even more confusion.

Think of CM7 performance settings as being able to choose the maximum stepping and the minimum stepping, not particular clock rates.

By default the Nook has 3 steppings(300mhz, 600mhz, 800mhz). In Nook Color Tweaks you can change those frequencies but you can't make it go to the 4th or 5th stepping. In other words, if you only used Nook Color Tweaks only stepping 1, stepping 2, and stepping 3 would be used.

When you increase the maximum frequency in CM7 performance settings or SetCPU, you are in essence telling the kernel to to use the 4th and/or 5th CPU stepping.

Here's how I use the two:
First thing I do is change CM7 performance settings to a max of 1200mhz. Then I choose set on boot. This makes it so the Nook will use all 5 steppings. From this point you should never need to look at CM7 performance settings again.

Now in Nook Color Tweaks you can change the clock rate for each of those 5 steppings. Once you changed that how you want it and verified its stable, you can set on boot for Nook Color Tweaks.

Note you do not need to go back to CM7 performance settings. Nook Color Tweaks changes will take affect immediately.

gudism · Jul 1, 2011

khaytsus said:
I was getting good deep sleep with wifi on in sleep mode, but given it's still doing "something" it was only sleeping about 70% of the time and was using around 1.5%/hr.

I've recently been having the wifi turn off at screen off and I get 100% (or more.... ) deep sleep and my drop is maybe 1% every 3-4 hours. I can go 2 days with reasonable amounts of use, 3 days with light usage this way without charging.

I'm going to leave it like this, at first I thought it'd be annoying having to wait on wifi but it really only takes about 10s. The biggest annoyance really is that it's a bit slow at first because everything is updating at once, which tends to peg the CPU.

I have resorted to doing this exact same thing, as my NC would sleep and run at 300mhz (or really lowest setting) nearly exactly the same time.

I figured it must be my email app (being K9) because this never happened before I started using any email on my NC. I have looked at all my settings etc for K9 and for the life of me everything seems right.......

but like you say, it isnt the worst situation having to turn wifi off and on again it you plan to leave it for a while, like work or sleeping.

harpo1 · Jul 1, 2011

dalingrin said:
Both, because they change different things. I know its confusing and its made me think about adding the functionality to Nook Color Tweaks but then the two could potentially conflict with each other adding even more confusion.

Think of CM7 performance settings as being able to choose the maximum stepping and the minimum stepping, not particular clock rates.

By default the Nook has 3 steppings(300mhz, 600mhz, 800mhz). In Nook Color Tweaks you can change those frequencies but you can't make it go to the 4th or 5th stepping. In other words, if you only used Nook Color Tweaks only stepping 1, stepping 2, and stepping 3 would be used.

When you increase the maximum frequency in CM7 performance settings or SetCPU, you are in essence telling the kernel to to use the 4th and/or 5th CPU stepping.

Here's how I use the two:
First thing I do is change CM7 performance settings to a max of 1200mhz. Then I choose set on boot. This makes it so the Nook will use all 5 steppings. From this point you should never need to look at CM7 performance settings again.

Now in Nook Color Tweaks you can change the clock rate for each of those 5 steppings. Once you changed that how you want it and verified its stable, you can set on boot for Nook Color Tweaks.

Note you do not need to go back to CM7 performance settings. Nook Color Tweaks changes will take affect immediately.

Great explanation. Now I completely understand the relationship between the two.

MedLine · Jul 1, 2011

thanks for new kernel, 061811 OC kernel problem-free nearly 2 weeks, time to move on.

trying to undervolt cm7 on 063011 but think my nook not cooperating. at stock voltage my sr_adjust_vsel (pastebin here) somewhat resembles what searius posted few days ago, with opp1 - 3 already undervolted although not as generously as searius. if i use Nook Tweaks to reduce opp1 - 3 by 100mV each i think my nook just adjusts the voltage right back to nearly where it was, if i'm reading the sr_adjust_vsel numbers correctly (pastebin here), regardless of any concurrent underclocking.

other than that it's probably going to be problem free with 063011 kernel, like it's been for a long time now.

dirtmaster88 · Jul 1, 2011

Don't post often but just wanted to give a shout out to say many thanks for all your hard work. Got my first nook just the other day and am really amazed at what it's all capable of, especially with your kernel running. It really woke up the beast inside of it

dalingrin · Jul 1, 2011

MedLine said:
thanks for new kernel, 061811 OC kernel problem-free nearly 2 weeks, time to move on.

trying to undervolt cm7 on 063011 but think my nook not cooperating. at stock voltage my sr_adjust_vsel (pastebin here) somewhat resembles what searius posted few days ago, with opp1 - 3 already undervolted although not as generously as searius. if i use Nook Tweaks to reduce opp1 - 3 by 100mV each i think my nook just adjusts the voltage right back to nearly where it was, if i'm reading the sr_adjust_vsel numbers correctly (pastebin here), regardless of any concurrent underclocking.

other than that it's probably going to be problem free with 063011 kernel, like it's been for a long time now.

Well, I am not overriding SmartReflex. I believe this process also warrants explanation:

SmartReflex is TI's version of dynamic voltage control. Every Nook has values in read-only registers that seeds the voltage calibration algorithms. These algorithms will choose a voltage per stepping based upon your specific hardware. In essense, the voltage assigned in the kernel is a sort of suggestion. SmartReflex will then take that suggestion along with the values in the read-only registers and decided on a voltage that is stable. In other words, when you assign a voltage for a stepping, SmartReflex will decide on a voltage based upon your input. SmartReflex has a limited window around your suggested voltage to choose from, for example it might be +/- 0.5v from what you choose in Nook Color Tweaks.

SmartReflex has two main purposes:
- By calibrating the voltage based on your hardware, the Nook can change the voltage as your CPU ages. Resistance often increases with age and may require additional voltage to remain stable, say 5 years from now.
- SmartReflex also aims to use the least voltage possible. Your Nook may need less voltage than mine does to remain stable at 800mhz.

So, SmartReflex actually undervolts already, as I've said in the past. However, SmartReflex is often fairly conservative with undervolting, especially on the upper steppings like 3, 4 and 5.

This means undervolting on stepping 1 or 2 may not have much, if any impact, on the final voltage the Nook decides to run. In my experience, stepping 1 and 2 are already well undervolted already and decreasing the voltage only leads to a 0.03v change. This may or may not be true for your Nook though as each can run at different voltages.

I think voltage control has the most value in the 4th and 5th stepping. Perhaps you only want to overclock to 1.1ghz. In this case, I would make stepping 5 1.1ghz and then decrease the voltage on stepping 5. Here, the voltage control can make a significant impact. The same can be true if you want to increase the voltage on stepping 4 or 5.

Also note that I reset the calibrated voltage after you change the voltage in Nook Color Tweaks. If you inspect sr_adjust_vsel you will see that the right hand columns will be 0x0. The calibration will not take place until your Nook changes steppings. Once the Nook goes to the stepping with 0x0 you will see it populate with the calibrated voltage.

actorman46 · Jul 1, 2011

So what are the advantages / disadvantages to playing around with the voltage? How does it effect overclocking? Just want to understand what I'm doing before I play around too much.

Sent from my NookColor using XDA Premium App

Jotokun · Jul 1, 2011

actorman46 said:
So what are the advantages / disadvantages to playing around with the voltage? How does it effect overclocking? Just want to understand what I'm doing before I play around too much.

Sent from my NookColor using XDA Premium App

By increasing voltage, you can potentially achieve higher overclocks, but risk damaging your hardware. By lowering voltage, you can potentially achieve better battery life without sacrificing performance, but risk instability.

I've only been playing around with undervolting for a little bit, but so far it looks like on mine, the limit for stepping 5 at 1.2ghz is 1.25v (default is 1.375). Setting it to anything lower causes the entire tablet to lock up the instant I hit apply. For stability testing I've been letting an N64 emulator run for a few minutes since it stresses the device enough to go to the highest stepping, going down in voltage a bit and repeating.

Edit: Spoke too soon. 1.25v isnt stable at that speed.

joenathane · Jul 1, 2011

Great work Dalingrin!

actorman46 · Jul 1, 2011

Jotokun said:
By increasing voltage, you can potentially achieve higher overclocks, but risk damaging your hardware. By lowering voltage, you can potentially achieve better battery life without sacrificing performance, but risk instability.

I've only been playing around with undervolting for a little bit, but so far it looks like on mine, the limit for stepping 5 at 1.2ghz is 1.25v (default is 1.375). Setting it to anything lower causes the entire tablet to lock up the instant I hit apply. For stability testing I've been letting an N64 emulator run for a few minutes since it stresses the device enough to go to the highest stepping, going down in voltage a bit and repeating.

Edit: Spoke too soon. 1.25v isnt stable at that speed.

Thanks! Makes perfect sense. I've started playing with undervolting and it helps with my nook's over heating when overclocked. This is a great!

Running stepping 3 4 and 5 at 1.30 and overclocked to 1200. Nook much cooler.

Sent from my NookColor using XDA Premium App

Jotokun · Jul 1, 2011

I've currently got mine at

1 (300mhz) - 0.8125v
2 (600mhz) - 1.0v
3 (800mhz) - 1.1875v
4 (1100mhz) - 1.25v
5 (1200mhz) - 1.3v

Could probably do a little better than that, I know 5 can run at 1.25 for a bit but then it starts randomly shutting off on mine. Still, its pretty good, hope its stable in actual day-to-day use. Looking forward to seeing what this does to my battery life.

dalingrin · Jul 1, 2011

Jotokun said:
I've currently got mine at

1 (300mhz) - 0.8125v
2 (600mhz) - 1.0v
3 (800mhz) - 1.1875v
4 (1100mhz) - 1.25v
5 (1200mhz) - 1.3v

Could probably do a little better than that, I know 5 can run at 1.25 for a bit but then it starts randomly shutting off on mine. Still, its pretty good, hope its stable in actual day-to-day use. Looking forward to seeing what this does to my battery life.

I can't go all the way down to 1.25v @ 1.1ghz

runhopskipjump · Jul 1, 2011

Jotokun said:
I've currently got mine at

1 (300mhz) - 0.8125v
2 (600mhz) - 1.0v
3 (800mhz) - 1.1875v
4 (1100mhz) - 1.25v
5 (1200mhz) - 1.3v

Could probably do a little better than that, I know 5 can run at 1.25 for a bit but then it starts randomly shutting off on mine. Still, its pretty good, hope its stable in actual day-to-day use. Looking forward to seeing what this does to my battery life.

Using the same voltages and settings with no major issues so far. I played an avi file in moboplayer, used greader pro, watched a couple YouTube view and typed this message. I will report any issues I come across. I only notice a slight lag with thumb keyboard and while rotating the screen.

Nooking with Encore/Mecha via DasBAMF

dalingrin · Jul 1, 2011

My settings for those who care:
300mhz @ 0.925v
600mhz @ 1.05v
800mhz @ 1.2v
1100mhz @ 1.275v
1200mhz @ 1.325v

[Kernel][Stock1.3][Already included in CM7] Dalingrin's OC kernel [09/01/11]

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