APPLIED: [PATCH] (oneiric) (drop after 3.0) Fix kernel oops when backlight off hotkey pushed

[Tim Gardner]

On 09/11/2011 12:08 AM, Ike Panhc wrote:
> There is a bug which will cause kernel panic has been found[1] and the revised
> patch is on mailing list[2].
>
> In ideapad_backlight_notify_power() when acpi_backlight=video, blightdev is
> NULL and kernel panic happen when driver tries to access it. The best way to
> solve this is to check blightdev at the top of the function.
>
> Oneiric kernel will be freezed on September 15th and looks like this patch
> will be merged into mainline after, but I strongly suggest to have this patch
> before kernel freeze because this patch can prevent kernel panic when user hit
> the backlight power hotkey.
>
> [1] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02340.html
>
> [2] http://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg02343.html
>
>
> The following changes since commit 6242e334ff8a9f1651c2515535d98485e343dcb1:
>
>    UBUNTU: Ubuntu-3.0.0-10.16 (2011-09-02 09:18:31 -0700)
>
> are available in the git repository at:
>    git://kernel.ubuntu.com/ikepanhc/public.git ideapad-for-oneiric-fix
>
> Rene Bolldorf (1):
>    ideapad: Check if acpi already handle backlight power in
>      'ideapad_backlight_notify_power' to avoid a page fault
>
>   drivers/platform/x86/ideapad-laptop.c |    2 ++
>   1 files changed, 2 insertions(+), 0 deletions(-)
>


-- 
Tim Gardner tim.gardner at canonical.com