[Bug 95124] New: Blinking display with 4.6-rc*

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95124

            Bug ID: 95124
           Summary: Blinking display with 4.6-rc*
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sgunderson at bigfoot.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123234
  --> https://bugs.freedesktop.org/attachment.cgi?id=123234&action=edit
dmesg from boot to the issue

I have a Lenovo X240, which has Haswell integrated graphics. On upgrade from
4.5.0 to 4.6-rc1, I noticed an extremely irritating issue; about every
minute, the display shows black for a brief moment (perhaps one or two
frames), then reverts back to the correct display. There are no other ill
effects that I can see, in particular nothing in dmesg. I tried with 4.6-rc4,
and it has the same issue.

Attached is a dmesg log with drm.debug=14, as requested by email. It's taken
right after the first blink.

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