[Bug 68165] New: [SNB IVB HSW eDP bisected]I-G-T/testdisplay -f causes eDP black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68165

          Priority: medium
            Bug ID: 68165
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB IVB HSW eDP bisected]I-G-T/testdisplay -f causes
                    eDP black
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Description:
--------------------
I-G-T/testdisplay -f doesn't work on eDP pipe, eDP screen will turn to black
after do this operation. This issue happens on SNB, IVB and HSW mobile. I
bisected on a SNB mobile, here is the bisect result:

commit fae5cbff3e3e4097de2e76178d462b90626c2bdb
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Sun Jul 21 21:37:09 2013 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Sat Jul 27 00:02:38 2013 +0200

    drm/i915: clean up crtc timings computation


Reproduce step:
----------------------
1. testdisplay -f 38.25,800,832,912,1024,600,603,607,624

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