Re: VSYNC problems on Fedora 21/22 and Intel HD graphics...

[Chris Wilson <chris chris-wilson co uk>]

On Wed, May 27, 2015 at 03:37:29PM -0400, Alex G.S. wrote:
>    Hello,
>    First of all I love the new GNOME 3.16 release.  The notifications and
>    system tray icons (in the left) are great and productivity boosters. 
>    However, I'm having some issues with Intel HD graphics on X11 that make
>    things very difficult.  Though these problems are solved by the Wayland
>    session it's still too unstable for me to use in production as a
>    day-to-day desktop.
>    Hardware:
>    Intel® Core™ i5-4200M CPU @ 2.50GHz × 4
>    Intel® Haswell Mobile (HD 4600, i965) 
>    GNOME:
>    Version 3.16.2
>    Kernel:
>    4.0.4-301.fc22.x86_64
>    Problem:
>    [1]https://bugzilla.gnome.org/show_bug.cgi?id=741376
>    At work I use two external monitors in addition to the laptop screen. 
>    VSYNC often breaks when using either SNA or UXA at random intervals.  It
>    also breaks also when I fullscreen any application in any monitor.  Even
>    when I force VSYNC in both xorg.conf and drirc it doesn't seem to help.
>    These are configurations for reference:
>    /etc/environment: 
>    CLUTTER_VBLANK=True
>    /etc/X11/xorg.conf.d/20-intel.conf 
>    Section "Device"
>       Identifier  "Intel Graphics"
>       Driver      "intel"
>      Option      "AccelMethod" "sna"
>      Option      "TearFree" "true"
>      Option      "SwapbuffersWait" "true"

Try Option "DRI" "2" in conjunction to the above.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre