Bug 361185 - Tearing on X11 with EGL
Summary: Tearing on X11 with EGL
Status: RESOLVED INTENTIONAL
Alias: None
Product: kwin
Classification: Plasma
Component: egl (other bugs)
Version First Reported In: 5.6.1
Platform: Gentoo Packages Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-03-30 13:23 UTC by equeim
Modified: 2016-04-01 14:41 UTC (History)
0 users

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Description equeim 2016-03-30 13:23:50 UTC 
VSync works fine with GLX, but not with EGL.
I use Gentoo ~amd64. media-libs/mesa-11.1.2 with radeonsi.
x11-base/xorg-server-1.18.1 and x11-drivers/xf86-video-ati-7.6.1_p20160324.
kde-plasma/kwin-5.6.1

Reproducible: Always
Comment 1 Martin Flöser 2016-04-01 13:28:35 UTC 
Then please use GLX.
Comment 2 Thomas Lübking 2016-04-01 14:41:58 UTC 
wild guess: no subpost, thus EGL_BUFFER_PRESERVED, thus no flipping, thus tearing (cause the swap isn't fast enough for the vblank time)

if you enable kwin debug output and start it from konsole, you should get a line like
   "EGL implementation and surface support eglPostSubBufferNV, let's use it"