I have this problem with a dual monitor setup. Happens for me with
VirtualBox and Frescobaldi as soon as the mouse goes into the app window
when it is started. When I look at Xorg.0.log.old immediately after
logging in on the X restart, I see the following near the end of the
log:
======================================================
Backtrace:
[ 763.337] 0: /usr/bin/X (xorg_backtrace+0x28) [0x4a0fa8]
[ 763.337] 1: /usr/bin/X (0x400000+0x60fcd) [0x460fcd]
[ 763.337] 2: /lib/libpthread.so.0 (0x7f2f849ff000+0xfb40) [0x7f2f84a0eb40]
[ 763.337] 3: /usr/bin/X (0x400000+0xbb22f) [0x4bb22f]
[ 763.337] 4: /usr/bin/X (0x400000+0x2c2d9) [0x42c2d9]
[ 763.338] 5: /usr/bin/X (0x400000+0x2184b) [0x42184b]
[ 763.338] 6: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7f2f8396ad8e]
[ 763.338] 7: /usr/bin/X (0x400000+0x213d9) [0x4213d9]
[ 763.338] Segmentation fault at address 0x4
[ 763.338]
Caught signal 11 (Segmentation fault). Server aborting
[ 763.338]
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
======================================================
I haven't yet tried the patch shown above. That's the next step...
--
Launching QT apps under Xinerama crashes Xorg : affects SpeedCrunch, KeePassX,
Lucky Backup, Pencil, Stellarium, Skype, Google Earth, VLC, Konqueror,
VirtualBox, Opera ...
https://bugs.launchpad.net/bugs/650539
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