On Wed, 2006-12-20 at 16:08 +0100, strawks wrote: > I have an Asus A6VA laptop (Intel Centrino, 1.8GHz Pentium-M). > > On Linux 2.6.18-3, when running on battery, the system works fine. But > when I plug the AC adapter, the system is very slow, CPU frequency stays > often below 40MHz. Running the following commands, CPU frequency goes up > to 1.8GHz after ~0.5 seconde and the system runs fine : > nice -20 bash -c "for((;;)); do echo -n; done" > > Removing the processor module (rmmod processor) solve this issue but of > course I have no more control over CPU frequency. > Inserting the module with max_cstate=1 also solves this issue, and I can > change CPU frequency with cpufreq-set. > > I have installed the same kernel on 3 (one of which is a Medion with > Centrino) other laptops and 2 desktop computers without encounting this > behaviour. > > This problem is present since the first 2.6.17 stock kernel. > > I'm currently staying with the stock 2.6.16-2 kernel since this is the > last working kernel on my laptop. > > Does anyone have seen the same behaviour on another laptop or desktop? > > > Googling around didn't get me anything. > > Any hint would be appreciated.
Maybe a bug in the cpu frequency governor? There was a long discussion on debian-devel in the beginning of this month about the difference between the ondemand and the conservative governor. -- Cheers, Sven Arvidsson http://www.whiz.se PGP Key ID 760BDD22
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