SRU request for LP#241229

[Tim Gardner]

Stefan Bader wrote:
> Wang, Yong Y wrote:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/241229
>>
>> SRU justification:
>>
>> The ACPI BIOSes of some problematic machines, e.g. Toshiba Satellite
>> L35, only export C1 when running on AC while the same machines support
>> more than C1 when running on battery. This results in
>> cpuidle_register_device not being called during system initialization
>> when running on battery. However, cpuidle_enable_device will be called
>> without cpuidle_register_device being called before when user switches
>> from AC to DC and _CST changed notification occurs, thus the oops. 
>>
>> Upstream bug report can be found at
>> http://bugzilla.kernel.org/show_bug.cgi?id=10394 and Cherry picking
>> upstream dcb84f335bee9c9a7781cfc5d74492dccaf066d2 can fix it.
>>
>> Fix is available below:
>>
>> The following changes since commit
>> 70cb93e6771963cca14ad9a3d87687484ee02428:
>>   Stefan Bader (1):
>>         UBUNTU: ACPICA: Fix for resource descriptor optimization issues
>> for _CRS/_SRC
>>
>> are available in the git repository at:
>>
>>   git://kernel.ubuntu.com/ywang/ubuntu-hardy.git master
>>
>> Yong Wang (1):
>>       UBUNTU: cpuidle acpi driver: fix oops on AC<->DC
>>
>>  drivers/acpi/processor_idle.c |   26 +++++++++++++++++++-------
>>  drivers/cpuidle/cpuidle.c     |   40
>> +++++++++++++++++++++++++++++++++++-----
>>  include/linux/cpuidle.h       |    3 ++-
>>  3 files changed, 56 insertions(+), 13 deletions(-)
>>
>> -Yong
>>
> Hi Yong,
> 
> looking at your backported patch I noticed that it also introduces an
> override option for cpuidle. Was this strictly necessary or rather
> because upstream just has this in place and the patch didn't apply
> otherwise?
> 
> Note to all: while I think the patch looks fairly simple and should not
> cause much impact, it still will change the ABI. Should we proceed with
> integration (since there is already another patch that changes the ABI)
> or rather try a PPA first?
> 
> Stefan
> 

ACK - there are already 2 ABI bumping patches pending since -19.34.

-- 
Tim Gardner tim.gardner at ubuntu.com