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

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

           Summary: Only the lowest CPU frequency available on laptop
                    working from battery.
           Product: Power Management
           Version: 2.5
    Kernel Version: 2.6.30+
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: v_2e@ukr.net
        Regression: Yes


Hello!
  I use a laptop with Mobile AMD Sempron processor and I've been experiencing
the following problem since kernel version 2.6.30:

  When I work from AC power adapter, everything is fine - the whole set of
frequencies for my processor are avalable (namely, 800 MHz, 1600MHz, 1800MHz,
2000MHz and 2200MHz).
  When I unplug the AC adapter, the CPU switches to 800MHz mode and I cannot
make it use any of the higher frequencies. I know for sure that this worked
fine with kernel v.2.6.29.
  This is very inconvenient - to use the lowest available frequency every time
I work from the battery. I have reported this bug to Gentoo Bugzilla at first.
Here is the link:

  http://bugs.gentoo.org/show_bug.cgi?id=328395

  There are some details on this story on that page.

I hope the bug (if it is one) will be fixed soon.
Thanks.

Vladimir.

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