[ltp] ibm r40 2722 cpu cooler running even when idle and battery runtime

Neil Weisenfeld linux-thinkpad@linux-thinkpad.org
Sun, 23 Nov 2003 10:24:33 -0500

Not sure if it's related, but when looking at a friend's T40p under
Windows XP, I noticed that one of the control panels stated that it was
in a really low speed setting while idle -- either 122 MHz or 200 MHz. 
I forget which. 

In any case, Linux now refuses to go below 600 MHz because that's the
officially documented lower limit.

This may be part of the discrepancy.


On Fri, 2003-11-21 at 21:02, flokno wrote:
> hello all!
> i own an ibm r40 2722, pentium m 1.5 ghz.
> kernel=2.4.22-ac4 with enhanced speedstep and apm enabled. acpi still
> seems broken. i also use cpudynd as a userspace daemon.
> when i let the computer switched on for a longer time (maybe 10 minutes)
> the cpu cooler starts to blow about every 5 minutes for 40 seconds even
> though the cpu is at 600mhz then.
> the behaviour is the same when on battery or on a/c.
> but when using windows xp the cpu is quite all the time when idle.
> what can i do to keep my cpu fan quite under linux too?
> another point is that my runtime on battery is only 3:10 hours compared
> to 5:something hours when in windows.
> so it doesn't seem that the cpu is completely speed stepped down. (or
> voltage is lowered?)
> i also want to have these 5 hours under linux...
> the two problems seem to be dependend somehow.
> maybe somebody knows any hints for my problems with this particular
> laptop!
> thanks in advance, 
>  flo