cpu speed problem
Karl Larsen
k5di at zianet.com
Thu Jul 26 15:14:02 UTC 2007
fedora wrote:
> Hi listers
>
> here is a laptop with
>
> [root at myhost ~]# cat /etc/fedora-release
> Fedora release 7 (Moonshine)
> [root at myhost ~]#
>
> worked well until 10 days ago. then, the laptop started its fan, and
> drove down its cpuspeed to about a quarter of the speed before. if i
> run the system-monitor, the cpu is busy always about 30 %, whereas
> before it was busy only about 6 %.
> The fan from then on is never stopped and the CPU stays low in
> performance from then on. i have to do a power down (either
> pm-hibernate or halt/reboot) in order to make it come up with the
> "full" performance and stay there for a while. after that, the fan
> starts again and the cpu slows down.
>
> after some googling i tried the following:
>
> [root at myhost ~]# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
> 997500
> [root at myhost ~]# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
> 731500
> [root at myhost ~]# echo "997500"
> >/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
> [root at myhost ~]# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
> 997500
> [root at myhost ~]#
>
> i also changed the parameters of the cpuspeed program, so that now it
> comes up with:
>
> 1413 ? Ss 0:01 cpuspeed -d -p 90 45 -m 731500 -M 997500 -n
>
> all to no avail.
>
> i also checked to see, whether in the BIOS the intelCPUstepping is
> enabled, and it is enabled.
>
> i understand, that the fan at a certain point in time starts turning.
> but i don't understand, why at the same time, the cpu slows down.
>
> has anyone got an idea, where this immediate change stems from and how
> i could stop it?
>
> thanks in advance for any reply
>
> suomi
>
I don't know your laptop but it sounds like you have a lot of dirt
and lint inside the box making it hard for the fan to cool. I have used
a vacume sweeper with a lot of suck and the crud really comes out.
--
Karl F. Larsen, AKA K5DI
Linux User
#450462 http://counter.li.org.
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