I've been following the steps to install the linux_phc module, and I got as far as ^anjie
I've downloaded and installed the 2.6.28-13.46~undervolt3 kernel from the PPA (via Update Manager), rebooted to it (although the grub menu says 2.6.28-13-generic), and I got this:
cat /sys/devices/system/cpu/cpu0/cpufreq/phc_controls : No such file or directory
I tried: cat: /sys/devices/system/cpu/cpu0: Is a directory
lsmod | grep acpi_cpufreq gives nothing (blank)
menu.lst looks normal, contains both 2.6.28-13-generic and 2.6.28-11-generic. Do I need to add the 2.6.28-13.46~undervolt3 entry to the list?
It seems as if I never installed the undervolt3 kernel, even though synaptics tells me its installed. Can anyone help?
I'm using an Intel Core 2 Duo T5500, dual boot with windows xp
No (automatic) fun here either.
Clean install of 9.04, updated everything (including kernel to 2.6.28-13), removed 2.6.28-11, added the PPA, ran Update Manager and let it install its stuff. This seems to have overwritten the original kernel, the acpi-cpufreq module exists but isn't loaded automatically ("CPU frequency scaling unsupported" popup after login and processor stuck at full speed). I've added it to /etc/modules and that seems to be working for now... is this supposed to happen? This is on a Core Duo (T2350) laptop, so nothing particularly exotic.
Did you add the acpi_cpufreq module to /etc/modules ? The modules isn't loaded automatically by the default Ubuntu startup scripts, as those suppose that the modules are built-in. If the /sys/devices/system/cpu/cpu0/cpufreq/ directory isn't there, the module has never been loaded.
Oops, I don't know what I'm doing, ignore me.
Last edited by Shikaku2; July 19th, 2009 at 08:10 PM.
Ok thanks for all the help
EDIT:
Finally got it to work!
After I downloaded and used PHC Tool
From http://linux.aldeby.org/linux-phc-cpu-undervolting.html
"There is no package, you have to download a subversion snapshot via:
sudo apt-get install subversion
svn co http://phctool.googlecode.com/svn/trunk/ phctool
The tool has a Analysis tab as you can see in the screenshot.
To get this to work, you first need to
sudo modprobe msr"
Last edited by asuna; January 5th, 2010 at 05:07 AM.
I hope this hasn't already been addressed in the thread. I tried looking for a while but did not see anything.
Nothing happens when I enter "lsmod | grep acpi_cpufreq". However I am using an Intel Core 2 Duo (which the howto states it has been tested with) and cannot figure out for the life of me why my kernal would be using a module for Centrino processors... (if it matters I'm also using 9.04, 2.6.28-13-generic)
Am I missing something here? Is there any other reason why I wouldn't get any output from that command?
Last edited by adempewolff; July 22nd, 2009 at 05:29 AM.
Ok maybe someone could help me out here. I re compiled the kernel per phc forum instructions, installed phc-k8, rebooted. Lsmod gives me phc-k8 as loaded, checking scaling_driver in cpufreq reports phc-k8, however, there are no phc-specific files in the cpufreq directory. ?? Any ideas?
It was mentioned before, but you'll have to add a line containing "acpi-cpufreq" to /etc/modules
Your processor isn't supported (yet). The current phc-k8 driver does not support undervolting for family 10h and family 11h processors (Phenoms and recent Turion X2 processors).
Last edited by Kiddion; July 24th, 2009 at 11:51 PM.
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