[Intel-gfx] OT: Video tearing

[Oliver Seitz]

Hi, perhaps one of the experts can answer this in a few words...

SandyBridge can prevent tearing only by using pageflipping.

pageflipping on Xorg always flips the whole framebuffer, so it can only 
be synced to one output device.

The vaapi-enabled MPlayer plays nice in fullscreen mode (via vaapi or 
gl), but sometimes tears in windowed mode.

Is this a MPlayer, Xorg, intel driver or SandyBridge problem? It's clear 
that pageflipping can not be syncronized to two displays at once, but I 
see no theoretical need for a video being fullscreen to make use of 
pageflipping.

Thank you for any hints!

Greets,
Kiste