https://bugzilla.kernel.org/show_bug.cgi?id=33742
Thomas Renninger <tr...@suse.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tr...@suse.de
Component|cpufreq |BIOS
AssignedTo|cpuf...@vger.kernel.org |acpi_b...@kernel-bugs.osdl.
| |org
Product|Power Management |ACPI
--- Comment #5 from Thomas Renninger <tr...@suse.de> 2011-04-21 10:13:12 ---
> and the problems that I am seeing date back from at least version 2.6.24, from
> what I can remember.
Most likely a BIOS, _PPC issue, yes it is:
before:
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit:2001000
after:
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit:800000
That means _PPC does not return 0 anymore and BIOS tells the OS to limit the
frequency. This is an ACPI problem, cpufreq subsystem bevhaves fine (at least
this was always the case with similar bug reports recently).
-> Re-assign to ACPI component.
> Please attach dmesg output including an AC unplug/replug cycle.
Best boot with log_buf_len=16777216
before you do the unplug/replug cycle copy this into a file, make it executable
and follow instructions:
==============
#!/bin/bash
echo 0xFFFFFFFF >/sys/module/acpi/parameters/debug_layer
echo 0xF >/sys/module/acpi/parameters/debug_level
echo 7 >/sys/module/cpufreq/parameters/debug
logger "Before unplug"
echo "It's time to unplug ..."
sleep 5
logger "AC got unplugged"
echo "It's time to re-plug"
sleep 5
echo 0x0 >/sys/module/acpi/parameters/debug_layer
echo 0 >/sys/module/cpufreq/parameters/debug
==============
and then attach whole dmesg and also acpidump output.
Hm, before you should check for a BIOS upgrade and whether you find related
BIOS settings.
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