Ubuntu
linux package

  1. Bug #1163720
  2. Comment #3

Comment 3 for bug 1163720

Revision history for this message
Kamal Mostafa (kamalmostafa) wrote : Re: Brightness control broken on XPS13 with 3.8.0-16

Reference information:

The regression was caused by this commit:
    0e7a2fe Revert "drm/i915: write backlight harder"

The reverted commit (719429a drm/i915: write backlight harder) is known to enable working backlight controls on the XPS 13 and some other models, but apparently causes black-screen or no-backlight-controls after suspend on some other models (per bugzilla report). Discussion of the revert starts about here: https://bugzilla.kernel.org/show_bug.cgi?id=47941#c41