ACPI: Add "acpi.power_nocheck=1" to disable power state check in power transition
authorZhao Yakui <yakui.zhao@intel.com>
Mon, 11 Aug 2008 06:57:50 +0000 (14:57 +0800)
committerLen Brown <len.brown@intel.com>
Wed, 22 Oct 2008 21:59:57 +0000 (17:59 -0400)
commitf5adfaa372c76423b6e8e4727a9701330374f364
treeb7783111c8f027d954506d7440d806817de13f6b
parenteab4b645769fa2f8703f5a3cb0cc4ac090d347af
ACPI: Add "acpi.power_nocheck=1" to disable power state check in power transition

   Maybe the incorrect power state is returned on the bogus bios, which
is different with the real power state. For example: the bios returns D0
state and the real power state is D3. OS expects to set the device to D0
state. In  such case if OS uses the power state returned by the BIOS and
checks the device power state very strictly in power transition, the device
can't be transited to the correct power state.

   So the boot option of "acpi.power_nocheck=1" is added to avoid checking
the device power in the course of device power transition.

http://bugzilla.kernel.org/show_bug.cgi?id=8049
http://bugzilla.kernel.org/show_bug.cgi?id=11000

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Documentation/kernel-parameters.txt
drivers/acpi/bus.c
drivers/acpi/power.c
include/acpi/acpi_drivers.h