[Intel-gfx] tearing and wavy output playing video on SandyBridge

[Dexter Filmore]

System: Core i5 2500T on a H67 Gigabyte board
OS: debian testing, 
intel driver 2.15
Mesa 7.10.3
kernel 2.6.39

Tested with SMplayer and XBMC (file 1080p x264 mkv): when zooming, panning etc 
the image tears and seems to lag in updating regions of the image. 

First time intel gfx user, anything I have to tweak in the players? Use 
something else but xv? Pass a switch in xorg.conf?

Hints appreciated

Regards

Dex

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