[Bug 23412] Only the lowest CPU frequency available on laptop working from battery.

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https://bugzilla.kernel.org/show_bug.cgi?id=23412





--- Comment #6 from Vladimir <v_2e@xxxxxxx>  2010-12-18 08:28:20 ---
(In reply to comment #5)
> Above helps (and this is hopefully what the bug is about) only if you see the
> limit here:
> /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
> 
  Yes, this is my case. I also mentioned this file in my bugreport on Gentoo
Bugzilla (the link to that bugreport is in the first message of this thread). I
do not remember the older kernels (before 2.6.30) to provide this file. And
like I said before, this file does store the lowest possible CPU frequency with
AC adapter off.
  I have found a BIOS feature "Andvanced power management", but triggering it
has no effect. I don't really know what is this feature for. So, there is no
way to change this behaviour tweaking the BIOS settings.

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