[Bug 99854] New: [DRI3] Jerky video/low FPS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99854

            Bug ID: 99854
           Summary: [DRI3] Jerky video/low FPS
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: hugo.chargois at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 129731
  --> https://bugs.freedesktop.org/attachment.cgi?id=129731&action=edit
Xorg.0.log, no problem occurring, smooth video

Xorg version: 1.19.1 (archlinux's package)
xf86-video-intel version: git's latest: 860c3664 (built from source)
uname -rm: 4.9.8-1-ARCH x86_64
lspci | grep VGA: 00:02.0 VGA compatible controller: Intel Corporation Xeon
E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)

Video playback looks like it's very low FPS, maybe ~10FPS or less. It doesn't
look like a video acceleration problem, the CPU usage is still very small. It
looks like a refresh problem.

An interesting thing is that the problem disappears as long as the mouse is
moving, as if it forces a high refresh rate. It reappears as soon as the mouse
is still.

The problem doesn't happen when I set
Option "DRI" "2"
in the config.

I also set Option "TearFree" "true" but I don't think it makes any difference,
the problem also happens without TearFree (with DRI3).

I don't have compton or any other compositor.

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