Arch Linux

tomdbike

Member

Registered: 2008-09-07

Posts: 25

PHC support?

Hey,

I have used PHC enabled acpi-cpufreq in Ubuntu (was already compiled) and it worked perfectly

I've hardly done any compiling so I don't know where to start to make it for the kernel I'm on, 2.6.26-ARCH.

Could anyone help me. Step by step? I would like to know how to apply the patch. (and where is this patch?)

Thanks!
Tom

emmmile

Member

From: Italy

Registered: 2008-11-07

Posts: 4

Re: PHC support?

Hi, I'm really interested too in this feature because my ASUS laptop is reaaally hot, and in Windows it worked very well so why don't put undervolt also here!
I'm not an expert but I think now the undervolt is working to me so I'll explain what I've done.

1) I installed the yaourt package

2) I serched for "phc":

yaourt phc

And I installed the kernel 2.6.27.ARCH-2 already patched with the phc support. For see if this works you can test it with uname -r and watching if you have the phc files:

ls /sys/devices/system/cpu/cpu0/cpufreq | grep phc

3) Now I installed, always from yaourt, the package phctool-svn that is graphical interface for change the voltages (or you can directly edit the files above I think). The phctray script doesn't work to me.. but the phctool is ok and says "PHC extensions avaible". The only problem is that I can't see the current voltages..

So I *think* that this works because if I set a voltage under 0.95V the computer freezes like happened on Windows XP with RMClock, and for me this is good because means that the voltage is really modified. Now I also downloaded a program called msrinfo (you can read https://www.dedigentoo.org/trac/linux-p … ubuntu_001) for show the current / target voltages and seems to work. I had some problems compiling it, if you want i can give the compiled file.

I hope this will help.. You can find something also here:
http://aldeby.org/blog/index.php/linux- … lting.html

I read this discussion too (http://bugs.archlinux.org/task/8500) about inserting this kernel patch by default in the arch kernel, but I didn't understand if this will be done / has been done.. Somebody can reply me?

Thanks a lot,
Ciaooooooooooooooo