The xorg logs have:
BUG: ../../dix/getevents.c:850 in scale_to_desktop()
[ 161.052]
Backtrace:
[ 161.052] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7fae55e04866]
[ 161.052] 1: /usr/bin/X (0x7fae55c7c000+0x621fe) [0x7fae55cde1fe]
[ 161.052] 2: /usr/bin/X (0x7fae55c7c000+0x62e6d) [0x7fae55cdee6d]
[ 161.052] 3: /usr/bin/X (GetPointerEvents+0xe2) [0x7fae55ce0202]
[ 161.052] 4: /usr/bin/X (0x7fae55c7c000+0x1730c6) [0x7fae55def0c6]
[ 161.052] 5: /usr/bin/X (miPointerWarpCursor+0xe7) [0x7fae55def547]
[ 161.052] 6: /usr/bin/X (0x7fae55c7c000+0x87081) [0x7fae55d03081]
[ 161.052] 7: /usr/bin/X (0x7fae55c7c000+0x173a9c) [0x7fae55defa9c]
[ 161.052] 8: /usr/bin/X (0x7fae55c7c000+0x1121a3) [0x7fae55d8e1a3]
[ 161.053] 9: /usr/bin/X (0x7fae55c7c000+0xfd08e) [0x7fae55d7908e]
[ 161.053] 10: /usr/bin/X (RRPointerScreenConfigured+0x75) [0x7fae55d792b5]
[ 161.053] 11: /usr/bin/X (RRTellChanged+0x11b) [0x7fae55d72a5b]
[ 161.053] 12: /usr/bin/X (RRCrtcSet+0x353) [0x7fae55d73b93]
[ 161.053] 13: /usr/bin/X (ProcRRSetCrtcConfig+0x3f3) [0x7fae55d74b33]
[ 161.053] 14: /usr/bin/X (0x7fae55c7c000+0x4e7a1) [0x7fae55cca7a1]
[ 161.053] 15: /usr/bin/X (0x7fae55c7c000+0x3d6aa) [0x7fae55cb96aa]
[ 161.053] 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed)
[0x7fae53e3776d]
[ 161.053] 17: /usr/bin/X (0x7fae55c7c000+0x3d99d) [0x7fae55cb999d]
[ 161.053] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
** Also affects: xorg (Ubuntu Precise)
Importance: Undecided
Status: New
** Changed in: xorg (Ubuntu Precise)
Importance: Undecided => High
** Changed in: xorg (Ubuntu)
Importance: Undecided => High
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
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https://bugs.launchpad.net/bugs/1002958
Title:
Moving external monitor around hard-locks x
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