[Bug 89979] New: VLV HDMI interlaced resolution wobble

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89979

            Bug ID: 89979
           Summary: VLV HDMI interlaced resolution wobble
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dan at reactivated.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Running linus master of today (also reproduced on 3.13), with this hardware:
00:02.0 VGA compatible controller [0300]: Intel Corporation ValleyView Gen7
[8086:0f31] (rev 0e)
Inside a Bay Trail M N2807

Choosing any of the 3 interlaced resolutions supported by my display results in
a "wobbly" output. It is as if on every update, even for static images, each
horizontal row of pixels gets jolted up/down/up/down.

I captured a video, the camera compensated a lot, it feels a lot worse than it
looks here, but to give you an idea:
https://www.youtube.com/watch?v=C9QhNf8fGxI

Please let me know how I can help with diagnosis/debug.

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