[Bug 55311] Since 3.7.1-17.1 radeon has no backlight when using vgaswitcheroo (regression)
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Fri Apr 12 05:12:28 PDT 2013
https://bugzilla.kernel.org/show_bug.cgi?id=55311
--- Comment #16 from Fede <fedevx at yahoo.com> 2013-04-12 12:12:28 ---
Bisect done, I can confirm the issue is due to the same commit:
==========================
a261b246ebd552fd5d5a8ed84cc931bb821c427f is the first bad commit
commit a261b246ebd552fd5d5a8ed84cc931bb821c427f
Author: Daniel Vetter <daniel.vetter@>
Date: Thu Jul 26 19:21:47 2012 +0200
drm/i915: disable all crtcs at suspend time
We need this to avoid confusing the hw state readout code with the cpt
pch plls at resume time: We'd read the new pipe state (which is
disabled), but still believe that we have a life pll connected to that
pipe (from before the suspend). Hence properly disable pipes to clear
out all the residual state.
This has the neat side-effect that we don't enable ports prematurely
by restoring bogus state from the saved register values.
Reviewed-by: Jesse Barnes <jbarnes@>
Signed-Off-by: Daniel Vetter <daniel.vetter@>
:040000 040000 172a95b49a63a014db9219e27b2762d35c33ebee
920e4028ba71530ca938231e7e39cde01b42d231 M drivers
===========================
What's the next step?
Thanks!
Fede
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