[Bug 109221] New: GM965 plays Chrome/Chromium videos slowly on VGA head

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109221

            Bug ID: 109221
           Summary: GM965 plays Chrome/Chromium videos slowly on VGA head
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: nemesis at icequake.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I do not know the technical details but can reproduce on demand.

My displays are configured with 1280x800 on the eDP panel and 1280x1024 on the
VGA head.

This has been the case for all 4.x kernel versions and at least three recent
Ubuntu distributions.

In Chrome/Chromium (all versions recent and latest), YouTube and videos from
similar video sites (it really doesn't matter which) drop frames significantly. 

Mitigation: If I configure the VGA head to 1024x768, the Chrome video frame
drops are reduced by about 1/2.  If I configure the VGA head to 800x600, any
Chrome video frame drops are then imperceptible.

I had long accepted this as a hardware limitation.

However! I just noticed today that if I use Firefox in the exact same
configuration, there are no frame drops and completely smooth video on the same
websites in the same 1280x800/1280x1024 CRTC configurations.

Clearly Chrome/Chromium is doing something different than Firefox, but I have
no idea what it could be.  Could I help determine what it is?

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