[Bug 61929] [HSW eDP regression 3.8.2] eDP blank until xrandr is re-run

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61929

--- Comment #7 from shui yangwei <yangweix.shui at intel.com> ---
(In reply to comment #6)
> I'm confused. Can you please cite the exact git sha1? There are already a
> few different sha1s mentioned in this bug report by you, and to me it's not
> clear which one it is.

Description:
-----------------
I have tested the parents:
35f8badc1cf652381fa3f82c1fbea39f4dbe87fd(on drm-next)
and 
210561ffd72d00eccf12c0131b8024d5436bae95(on drm-intel-fixes)

Both of the parents git sha1 are good, but if I tested with the merged commit
in drm-next which I listed below, this bug will come up. I guess it's the
problem by merging.

--------------------------
commit b81e059ec5a7128622ab5d74d78e9b4f361b54ae
Merge: 35f8bad 210561f
Author: Dave Airlie <airlied at redhat.com>
Date:   Wed Feb 20 11:40:49 2013 +1000

    Merge branch 'drm-intel-fixes' of
git://people.freedesktop.org/~danvet/drm-intel into drm-next

    So here's my promised pile of fixes for 3.9. I've dropped the core prep
    patches for vt-switchless suspend/resume as discussed on irc. Highlights:
    - Fix dmar on g4x. Not really gfx related, but I'm fed up with getting
      blamed for dmar crapouts.
    - Disable wc ptes updates on ilk when dmar is enabled (Chris). So again,
      dmar, but this time gfx related :(
    - Reduced range support for hsw, using the pipe CSC (Ville).
    - Fixup pll limits for gen3/4 (Patrick Jakobsson). The sdvo patch is
      already confirmed to fix 2 bug reports, so added cc: stable on that one.
    - Regression fix for 8bit fb console (Ville).
    - Preserve lane reversal bits on DDI/FDI ports (Damien).
    - Page flip vs. gpu hang fixes (Ville). Unfortuntely not quite all of
      them, need to decide what to do with the currently still in-flight ones.
    - Panel fitter regression fix from Mika Kuoppala (was accidentally left on
      on some pipes with the new modset code since 3.7). This also improves
      the modeset sequence and might help a few other unrelated issues with
      lvds.
    - Write backlight regs even harder ... another installement in our eternal
      fight against the BIOS and backlights.
    - Fixup lid notifier vs. suspend/resume races (Zhang Rui). Prep work for
      new ACPI stuff, but closing the race itself seems worthwile on its own.
    - A few other small fixes and tiny cleanups all over.

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