APPLIED: [PATCH 0/1] [Natty SRU] Fix C state selection and reduce power consumption

[Tim Gardner]

On 06/22/2011 03:40 AM, Colin King wrote:
> From: Colin Ian King<colin.king at canonical.com>
>
> SRU Request:
>
> When running the 'stress' stress testing tool a Lenovo Edge 11 locks
> up because of CPU overheating.  This is fixed using upstream patch
> "cpuidle: menu: fixed wrapping timers at 4.294 seconds" (merge
> commit f310642123e0d32d919c60ca3fab5acd130c4ba3 and 2.38.y stable
> commit 4a1163dff6592dcee594b2bee597aafd749b93ee).
>
> This patch fixes errors in predicted sleep times which selected
> incorrect C states, causing increased power consumption and on some
> machines overheating and critical thermal shutdown. The bug also
> broke cpuidle state residency statistics which made it hard to spot
> this bug.
>
> With this fix, the Lenovo runs the stress test without locking up.
> Also this fix reduces overall power consumption and hence longer
> battery life.
>
> BugLink: http://bugs.launchpad.net/bugs/774947
>
> Tero Kristo (1):
>    cpuidle: menu: fixed wrapping timers at 4.294 seconds
>
>   drivers/cpuidle/governors/menu.c |    4 +++-
>   1 files changed, 3 insertions(+), 1 deletions(-)
>
>


-- 
Tim Gardner tim.gardner at canonical.com