*** This bug is a duplicate of bug 49360 ***
https://bugs.launchpad.net/bugs/49360
First I must say that I'm quite dissapointed that this bug is still in
"Unconfirmed" status as it is really easy to reproduce it with a large
resolution video (and i810).
However, I have finally found where the problem lies :
It is the i810 driver default for "CacheLines" . From i810's man page :
Option "CacheLines" "integer"
This allows the user to change the amount of graphics memory
used for 2D acceleration and video. Decreasing this amount
leaves more for 3D textures. Increasing it can improve 2D per-
formance at the expense of 3D performance. Default: depends on
the resolution, depth, and available video memory. The driver
attempts to allocate at least enough to hold two DVD-sized YUV
buffers by default. The default used for a specific configura-
tion can be found by examining the Xorg log file.
Default value on my system is 256. After modifying this parameter to a larger
(768) value this problem disappears. I think a better default should be set
in the i810 driver and the problem should be passed to i810 developers.
As HD videos are more and more available, a saner default for this
parameter is necessary.
--
Xorg can't handle large XV buffers (badalloc)
https://bugs.launchpad.net/bugs/52490
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