On Thu, Mar 11, 2010 at 10:28 PM, Fabio Comolli <fabio.comolli@xxxxxxxxx> wrote: > Hi. > > On Tue, Mar 9, 2010 at 11:58 PM, Fabio Comolli <fabio.comolli@xxxxxxxxx> wrote: >> Hi. >> I have an EeePC 900 running 2.6.34-rc1. >> >> If I boot it on AC the cpu runs at full speed, 900MHz; if I boot it on >> battery it runs only at 630Mhz. Plugging / unplugging the AC does not >> change the cpu frequency. Only a reboot can change the situation. >> >> I already tried to echo 0 or 1 to the >> /sys/devices/platform/eeepc/cpufv file; no effects, even if the file >> changes its value. >> >> This is not a regression from 2.6.33: this behavior is also present in >> that version. >> >> Does this ring any bells? This is really annoying, especially when >> trying to watch a movie on battery. Also 3D apps show a 30% >> performance drop, as expected. >> >> Regards, >> Fabio > > Well, it turns out that this is indeed a regression, but I don't know > from which kernel version. > I reverted (not cleanly) this patch: > > http://patchwork.kernel.org/patch/28591 > > and now > > echo 1 > /sys/devices/platform/eeepc/cpufv > > enables the powersave mode and > > echo 0 > /sys/devices/platform/eeepc/cpufv > > enables the performance mode. > > Tested with the non-benchmark glxgears (275 frames/sec in powersave > mode and 405 in performance mode) and stellarium (14 frames and 20 > frames). > > Regards, > Fabio > Thanks for the report, Could you try to add a quick printk to show the value stored in set_acpi(CM_ASL_CPUFV, value); ? And also, could you send the result of acpidump ? Thanks, -- Corentin Chary http://xf.iksaif.net -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
