This issue has been plaguing my triple-headed setup as well, keeping me
from adding a 32" HDTV as a fourth monitor for a combination of
multiple-network monitoring, better media capability, and bragging
rights.
One thing I noticed: while trying out a few Playstation emulators, one
caused my primary display to resize to 640x480, and it couldn't be
resized without rebooting the machine. However, the entire time it was
set to that resolution, the system was stable --- for the first time
since going to 10.04+GNOME (and, indeed, Ubuntu in general --- I'm a
relatively-new convert from Mandriva+KDE with regard to desktop).
For posterity, my current xorg.conf is attached. (Subject to change
multiple times weekly, mind you, as I continue to attempt to find a
resolution. ;-P)
Things of note:
1.) The mouse will hang at least once per day, seemingly at random, and
sometimes multiple times per day.
2.) The mouse will *ONLY* hang between screens zero (0) and one (1). There
has never been an issue with the other screen seam.
3.) Screen 0 is on an nVidia GeForce 8400 GS, while Screen 1 and Screen 2
are on an nVidia GeForce 9400 GT.
4.) Again, while Screen 0 was at 640x480, there was no issues for > 14
days. Coincidence?
** Attachment added: "xorg.conf"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/570151/+attachment/1486503/+files/xorg.conf
--
mouse stuck between screens with xinerama
https://bugs.launchpad.net/bugs/570151
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