CPU throttling problems
Eduardo Robles Elvira
edulix at gmail.com
Tue Apr 12 22:31:15 UTC 2005
hi people !
I'm having big headhaches with my laptop and (k)ubuntu. It happens that every
once in a while, system heats and thus laptop fan start to spin. And that's
when my system becomes _slow_.
I've found that normally my system has CPU Throttling to 0%, but when it
becomes slow it turns to 75%. And I've also found that you can see actual
throttling state by executing:
$ sudo cat /proc/acpi/processor/CPU0/throttling
and you can modify it by doing:
$ sudo echo <number from 0 [0%] to 8 [85%]>
But it happens that when fan start spinning and throttling turns to 7, "$
sudo echo 0 > /proc/acpi/processor/CPU0/throttling" stop working. It just
doesn't obey me! Obviously, when I change throttling via klaptop system tray
icon, it doesn't obey me neither.
How could I fix this situation? I don't want throttling to change from 0. I
want it _always_ in 0! I've tried to tue my system configuration with klaptop
but that doesn't work, belive me...
Ah also, I wouldn't blame to BIOS or something like that: I have been using
suse for nearly 6 months in this laptop, and this problems _never_ happened
to me. I still have it installed and it just doesn't have this problem.
Can anyone help me please ? My temporal solution is just disabling throttling
in the kernel. Via lsmod I've seen that I have loaded a module called
"acpi_cpufreq", so I thought that maybe if I disable it I could just stop all
the whole problem.
That module doesn't appear in /etc/modules so I thought that most probably
it's bbeing loaded by hotplug. It doesn't appear to be the case neither,
because I've added acpi_cpufreq to /etc/hotplug/blacklist, but it's still
lodaded at boot!
Can anyone show me a light, even if it's damn small ? I just need one ;-).
Thanks for your time,
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