[Bug 79386] New: Intermittent flickering on KMS, constant flickering on X11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79386

          Priority: medium
            Bug ID: 79386
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Intermittent flickering on KMS, constant flickering on
                    X11
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: narthana.epa+freedesktop at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg 6.7.0
         Component: DRM/Intel
           Product: DRI

The laptop's display will flicker intermittently when booted with KMS enabled.
It will flicker constantly in X11 (see the attached videos). The hardware is an
Acer Aspire TimelineU M5-581TG-6666, with a Intel Core i5 3317U. It also has a
nVidia 640M, but this happens whether bumblebee is enabled or not.

It is possible that this issue is the same as Bug 78161 because it appears to
have been caused by the same commit:
http://cgit.freedesktop.org/drm-intel/commit/?h=drm-intel-next&id=3600836585e3fdef0a1410d63fe5ce4015007aac
whereas
http://cgit.freedesktop.org/drm-intel/commit/?h=drm-intel-next&id=4e53c2e010e531b4a014692199e978482d471c7e
is good.

However, the video of the flickering looks different and it is claimed that the
lastest nightlies fix Bug 78162, but this is not the case with this issue.

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