[Bug 96461] New: Video artifacts with FBC enabled on HSW using GNOME

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96461

            Bug ID: 96461
           Summary: Video artifacts with FBC enabled on HSW using GNOME
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: thatslyude at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124421
  --> https://bugs.freedesktop.org/attachment.cgi?id=124421&action=edit
FBC test suite results

This was kind of a difficult bug to track down. If you're using a Haswell
system running GNOME and you have fbc completely enabled and working, playing
videos can result in video artifacts. Steps to reproduce:

- Run GNOME
- Ensure FBC is enabled and active
- Download a movie, I used the ogg version of Big Buck Bunny for this
- Run `gst-launch-1.0 filesrc location='some_movie.ogg' ! decodebin !
glimagesink` in a terminal
- Watch for about over a minute, you'll see small horizontal lines go down the
screen.

Interestingly enough, there's three things that make this bug go away:
- Turning off FBC through `i915.enable_fbc=0`
- Using something other then GNOME
- Using the modesetting DDX

Seen on a ThinkPad T440s

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