drm/i915: quirk asserts controllable backlight presence, overriding VBT

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commit 9c72cc6f00 upstream.

commit c675949ec5
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Wed Apr 9 11:31:37 2014 +0300

    drm/i915: do not setup backlight if not available according to VBT

caused a regression on machines with a misconfigured VBT. Add a quirk to
assert the presence of a controllable backlight. Use it to ignore the VBT
backlight presence check during backlight setup.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
Tested-by: James Duley <jagduley@gmail.com>
Tested-by: Michael Mullin <masmullin@gmail.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Add cc: stable because the regressing commit is in 3.15.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Scot Doyle 2014-07-03 23:27:50 +00:00 • committed by Greg Kroah-Hartman

parent bef3c4fb49

commit 5cdcf7536f

3 changed files with 15 additions and 2 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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8

drivers/gpu/drm/i915/intel_display.c

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8

drivers/gpu/drm/i915/intel_panel.c

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