Re: "new" (aus of 2.6.20) acpi_cpufreq and thinkpad z61m
Thomas Renninger <trenn <at> suse.de>
2007-02-04 23:20:00 GMT
On Sun, 2007-02-04 at 11:57 +0100, Dietz Proepper wrote:
> I've been playing around a lttle with a thikpad z61m (core 2 duo cpu, 945
> chipset) and acpi_cpufreq from 2.6.20-rc6 and found the follwoing strage
> Under "normal" circumstances, if I disconnect the ac power, the laptop
> pulls about 18W from the battery when idle (which nearly matchs idle
> consumption under Windows XP and is totally ok for the machine).
> But, every now and then, idle consumption goes up to about 25W, and goes
> down again only after a reboot (suspending to disk and resuming does not
> help). Needlessly to say that max/min frequencies are set to the right
> value and /sys/.../cpuinfo_cur_freq is at the min freq.
It could also be the processor sleeping states:
Try to unload drivers that could poll hardware and/or produce bus master
AFAIK this could be some wlan and USB modules and possibly others.
If you want to play a bit with power consumption:
latest -mm kernel should have dyntick patches in, which disables the
timer interrupt for a while in idle to be able to stay in deeper
for longer time. This should save you (if bus master activity stays low
programs do not poll too much) a lot of battery life time.