[Intel-gfx] output stutters

[Brian J. Murrell]

On Sun, 2015-06-07 at 13:11 -0400, Brian J. Murrell wrote:
> I have an:
> 
> 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
> 
> in a Fedora 21 machine running Linux 4.0.4.
> 
> While this is all generally working, the display has pauses where there
> should be fluid motion.  Watching a video with mplayer for example,
> plays about a second or so, then pauses for .25 to .5 (just a guess) of
> a second and then continues playing.  glxgears does the same thing.
> While it's reporting ~60fps the gears turn then stop then turn then
> stop.
> 
> I see the same thing dragging windows across the screen or even just
> scrolling (GTK3) application windows.
> 
> I'm using both the DVI and the VGA output of this card, FWIW.
> 
> What additional information can I provide to help diagnose this problem?

Is there anything I can do to help debug what this issue is?

The pauses translate into sponginess and latencies that make using this
display very unpleasant.  :-(

b.


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