[Bug 83130] New: [BDW Bisected] Screen flickers when it changes to console from X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83130

          Priority: medium
            Bug ID: 83130
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Bisected] Screen flickers when it changes to
                    console from X
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

==System Environment==
--------------------------
Regression: Yes. Good commit: 3a5f87c286515c54ff5c52c3e64d0c522b7570c0
    drm: fix plane rotation when restoring fbdev configuration

Non-working platforms: Broadwell

==kernel==
--------------------------
-nightly: c30b73ce7c138b5fd671ed3a7e1301bd273fd661 (fails)
    drm-intel-nightly: 2014y-08m-26d-16h-36m-49s integration manifest
-queued: c1f7ab8c9a7b09f4ed6499904298ddf1c67b1764(fails)
    drm/i915/bdw: Do not initialize PPGTT in the legacy way for execlists
-fixes: a4bf214ffc721f3b82321714d614be937b982a94 (works)
    drm/i915: Move intel_ddi_set_vc_payload_alloc(false) to
haswell_crtc_disable()

==Bug detailed description==
-----------------------------
Screen starts to flicker after I start X or back to console from X. I will
attach a Video later.

==Reproduce steps==
---------------------------- 
1. start X 
or shatr X and chvt 1

==Bisect results==
----------------------------
Bisect shows: 3497c2a466ef2c72305180df5a09955ba95550cd is the first bad commit.
commit 3497c2a466ef2c72305180df5a09955ba95550cd
Author:     Deepak S <deepak.s at intel.com>
AuthorDate: Mon Aug 18 10:35:27 2014 -0700
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Tue Aug 26 12:54:10 2014 +0200

    drm/i915: Bring UP Power Wells before disabling RC6.

    We need do forcewake before Disabling RC6, This is what the BIOS
    expects while going into suspend.

    v2: updated commit message. (Daniel)

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