Bug#735322: xserver-xorg-video-intel: Playing video refreshes improperly
You need to enable the sna accel method.
Something like this in /etc/X11/xorg.conf should work:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
EndSection
You may get some minor display corruption when scrolling
long pages in browsers, but that's likely less annoying
than totally broken video playback.
This is fixed in intel driver 2.99 (and sna is enabled by
default) but it doesn't seem Debian packaged yet.
Brice
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