Right driver for cpufreq
Satish Balay
balay at fastmail.fm
Tue Oct 26 21:35:08 UTC 2004
On Tue, 26 Oct 2004, Mitko Haralanov wrote:
> Hi, I just installed Fedora Core 2 on my Dell Latitute C800 laptop and I
> having trouble getting the cpu frequency scaling to work. The
> /proc/cpuinfo file shows the cpu as:
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 8
> model name : Pentium III (Coppermine)
> stepping : 10
> cpu MHz : 997.943
>
> however, I can't seem to find the driver that I have to use. I have
> tried all the drivers in
> /lib/modules/2.6.8-1.521/kernel/arch/i386/kernel/cpu/cpufreq/ and none
> of the load.
>
> I would really appreciate any help since I have to go on a trip and I
> will need to use the laptop but under current setup, the battery last
> about 5 seconds.
Don't remember all the details about FC2, but the speedstep driver is
compiled the kernel - (hence fewer listings in
/lib/modules/2.6.8-1.521/kernel/arch/i386/kernel/cpu/cpufreq than in
FC1 kernel) - and it gets detected automatically (FC1 requires
'modprobe speedstep-centrino')
I had briefly used this on a thinkpad with Pentium-M & speedstep was
working fine.
A couple of things to verify.
- Your CPU is 1GHz and always at that speed?
- do you have /proc/cpufreq ? (its on fc1 - don't remember fc2)
- is /etc/init.d/cpuspeed daemon running? (if not - try starting/restarting)
- once cpuspeed starts - do the following commands change the state?
killall -SIGUSR1 cpuspeed # force max freq
killall -SIGUSR2 cpuspeed # force min freq
killall -SIGHUP cpuspeed # go back to dynamic freq scaling
Satish
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