[Bug 55311] Since 3.7.1-17.1 radeon has no backlight when using vgaswitcheroo (regression)

[bugzilla-daemon at bugzilla.kernel.org]

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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