[Bug 81940] New: [BDW Regression]eDP can't be lighted up after Xrandr rotate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81940

          Priority: medium
            Bug ID: 81940
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]eDP can't be lighted up after Xrandr
                    rotate
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103716
  --> https://bugs.freedesktop.org/attachment.cgi?id=103716&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. Good commit:
(-next-queued)d4ef41ce151988411dec8b089636d9ecbd1da559

Non-working platforms: Broadwell

==kernel==
--------------------------
-nightly: c95053d599112ec3b8c27a632e3c1544558891a4 (failed)
    drm-intel-nightly: 2014y-07m-30d-22h-36m-53s integration manifest
-queued: 5193109cd669c7990b043a7187548546c16f8af3 (failed)
    drm/i915: Align intel_dsi*.c files a bit
-fixes: f4be89cecea437aaddd7700d05c6bdb5678041f7 (works)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
-----------------------------
start X, and do rotate. eDP panel can't be lighted up.
==Reproduce steps==
---------------------------- 
1. xinit &
2. xrandr --output eDP1 --rotate left

==Bisect results==
----------------------------
Bisect shows: b6d547791fd3ef4ccc89ad2556ab01045640aef7 is the first bad commit
commit b6d547791fd3ef4ccc89ad2556ab01045640aef7
Author:     Rodrigo Vivi <rodrigo.vivi at intel.com>
AuthorDate: Fri Jul 11 10:30:19 2014 -0700
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Jul 23 07:05:21 2014 +0200

    drm/i915: Enable PSR by default.

    Panel Self Refresh is an eDP power saving feature specified by VESA's eDP
v1.3,
    that allows some panel componets to shutdown while you still see static
images on
    the screen. Besides being supported on the platform it must be supported by
the
    eDP panel itself.

    Now that we have the propper frontbuffer tracking support and correct locks
on place
    we can enabled this feature by default.

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