[Intel-gfx] Regression: Backlight not coming on after resume.

[Jani Nikula]

On Thu, 28 Feb 2013, James Courtier-Dutton <james.dutton at gmail.com> wrote:
> Bisect done on tree:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> Worked on 3.7.
> Broken on 3.8
>
> Problem: "Backlight not coming on after resume."
> git finally bisected  for my Samsung Serial 7 Laptop.
> Bisecting: 0 revisions left to test after this (roughly 0 steps)
> [cf0a6584aa6d382f802f2c3cacac23ccbccde0cd] drm/i915: write backlight
> harder     <- This is the problem commit. Seems that fixing some
> machines breaks others, based on the existing comments on that patch.

The backlight haunts us again. Could you post the dmesg with
drm.debug=0xe module parameter, first running vanilla 3.8, and then with
the bad commit reverted, please?

Might not be a bad idea to file a bug on Product=DRI,
Component=DRM/Intel at https://bugs.freedesktop.org (see
https://01.org/linuxgraphics/documentation/how-report-bugs-0 for
details) and attach your bisect results and the dmesgs there.

Thanks,
Jani.