Thread: Saving battery power with underclocking, low voltage etc.
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tonism is offline tonism
2010-05-05 , 08:22
Posts: 20 | Thanked: 37 times | Joined on May 2010 @ Estonia
#90
Originally Posted by calltrace View Post
I have question - is that file
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies
depending on some kernel module , or setting ?
My kernel is titan's kernel @ ulv ...

Edit : afater some more searching - is this feautured only in 25 i have 24 from extras-testing
When I had titan24 kernel I disabled my 250 MHz from that exact file because it wanted to go back to 500 MHz after Phone app.

Now, after updating to titan25, I still have the same file with the same 125 and 250 MHz disabled, but I'm not sure if it's used anymore. My guess is that it is. But titan would be the one to know (or someone who have played around with it)

Originally Posted by automagic68 View Post
Can I do this with the minimum frequency at 250? and did you use ULV or XLV? I can edit the voltage values aslong as I have version 25 installed?
Sure, you just have to remove 250 MHz from /sys/devices/system/cpu/cpu0/cpufreq/ondemand/avoid_frequencies
Modify your minimum speed from my conf AND make a voltage profile to it since currently it begins from 500 MHz.

And my conf is based on titan ideal kernel-25. The ideal conf has even lower voltages than XLV. See more from http://wiki.maemo.org/Overclocking#t...s_ideal_kernel

It should also be noted that everything above 850 MHz acts as same as titan's ideal voltages. I do not use over 850 MHz myself and therefore published my conf as soon as I got it stable and running smooth