cpu frequency selectors how to change them?, cpufreq-selector command not working
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cpu frequency selectors how to change them?, cpufreq-selector command not working| helikaon |
Posted: Oct 26 2011, 06:21 PM
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 SLF Moderator  Group: Moderators Posts: 516 Member No.: 4 Joined: 8-April 11  |
Hi guys, just asking if someone tried to change cpu frequency selectors on your SL? I just tried and i fail at it. Problem is, i noticed while on running my laptop on battery, my both cores ran at max speed (2.1ghz), so i tried them to scale them down as i was used to do on SL 5x. But it does not work ...
but it should work, because my kernel has those modules:
and i can even load them manually:
So it's there, but still the loading utility fails (and my core happily wolf down on battery)  -------------------- |
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| AndrewSerk |
Posted: Oct 27 2011, 12:45 AM
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 SLF Moderator Group: Moderators Posts: 524 Member No.: 54 Joined: 14-April 11 |
Hello helikaon,
Not sure if this is the issue, but I have the acpi_cpufreq and cpufreq_ondemand modules loaded and cat /proc/cpuinfo shows they are throttled. Hope this helps, |
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| helikaon |
Posted: Oct 27 2011, 04:16 AM
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SLF Moderator Group: Moderators Posts: 516 Member No.: 4 Joined: 8-April 11 |
Thx for reply, it's kind of strange, i didnt have the "acpi_cpufreq" loaded and even after i loaded it via modprobe, both my CPU cores still run at full speed and actually I had no *cpufreq* modules loaded at all at the beginning and i loaded them via modprobe - as shown at first post.. .
After i manually loaded the "acpi_cpufreq" i'm able now to run the "[root@orionis ~]# cpufreq-selector -g powersave" but with no impact at all, the cores still at max speed ... I'll try reboot my laptop and see. I'm on conference, so i've been suspending to RAM only and not shutting down... Ok, i rebooted laptop with power cord plugged in and with it plugged off, to try to activate appropriate power modes (as stated in 'system settings -> power management' in my KDE), but no change. Both cores runs at full speed and 'lsmod' still show no '*cpufreq*' kernel modules loaded at all ... Can anyone else please check if "lsmod | grep cpufreq" show him appropriate modules loaded? Thank You  This post has been edited by helikaon: Oct 27 2011, 04:53 AM -------------------- |
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| U308 |
Posted: Oct 27 2011, 06:10 AM
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SLF Advocate Group: Members Posts: 487 Member No.: 32 Joined: 11-April 11 |
Have you tried it the easy way ? i.e. adding the cpu freq. scaling monitor to panel.
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| helikaon |
Posted: Oct 27 2011, 10:49 AM
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SLF Moderator Group: Moderators Posts: 516 Member No.: 4 Joined: 8-April 11 |
Ok guys, thx for tips, solved. As usuall, it was 'small missing thingie' - i've installed the SL as 'base' system without anything and then been adding piece by piece the rest of OS packages. Apparently, there is new OS service in SL 6, so i had to do:
now my CPU cores scaled back to nice base 800MHz and my battery is happy Note (frome TUV docs): Procedure 3.2. Enabling a CPUfreq Governor 1. If a specific governor is not listed as available for your CPU, use modprobe to enable the governor you wish to use. For example, if the "conservative" governor is not available for your CPU, use the following command: modprobe cpufreq_conservative 2. Once a governor is listed as available for your CPU (via 'lsmod' command), you can enable it using: echo "conservative" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor Also note, if you have more CPU cores, repeat it for each core - so here it is 'cpu0', in case of dual core CPU, replace the 'core0' with 'core1' in the line. This is needed, because you can have different governor for each CPU core. cheers, This post has been edited by helikaon: Oct 27 2011, 11:11 AM -------------------- |
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