lot of these in the server logfile:
[ 31890.929] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
BUG: ../../dix/getevents.c:849 in scale_to_desktop()
[ 31890.959]
Backtrace:
[ 31890.971] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7f7d236212f6]
[ 31890.971] 1: /usr/bin/X (0x7f7d23499000+0x620de) [0x7f7d234fb0de]
[ 31890.972] 2: /usr/bin/X (0x7f7d23499000+0x62d4d) [0x7f7d234fbd4d]
[ 31890.972] 3: /usr/bin/X (GetPointerEvents+0xe2) [0x7f7d234fd0b2]
[ 31890.972] 4: /usr/bin/X (0x7f7d23499000+0x172b56) [0x7f7d2360bb56]
[ 31890.972] 5: /usr/bin/X (miPointerWarpCursor+0xe7) [0x7f7d2360bfd7]
[ 31890.972] 6: /usr/bin/X (0x7f7d23499000+0x86f61) [0x7f7d2351ff61]
[ 31890.972] 7: /usr/bin/X (0x7f7d23499000+0x17352c) [0x7f7d2360c52c]
[ 31890.972] 8: /usr/bin/X (0x7f7d23499000+0x111fe3) [0x7f7d235aafe3]
[ 31890.972] 9: /usr/bin/X (0x7f7d23499000+0xfcece) [0x7f7d23595ece]
[ 31890.972] 10: /usr/bin/X (RRPointerScreenConfigured+0x75) [0x7f7d235960f5]
[ 31890.972] 11: /usr/bin/X (RRTellChanged+0x11b) [0x7f7d2358f89b]
[ 31890.972] 12: /usr/bin/X (RRCrtcSet+0x353) [0x7f7d235909d3]
[ 31890.972] 13: /usr/bin/X (ProcRRSetCrtcConfig+0x3f3) [0x7f7d23591973]
[ 31890.972] 14: /usr/bin/X (0x7f7d23499000+0x4e761) [0x7f7d234e7761]
[ 31890.972] 15: /usr/bin/X (0x7f7d23499000+0x3d68a) [0x7f7d234d668a]
[ 31890.972] 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed)
[0x7f7d2165476d]
[ 31890.972] 17: /usr/bin/X (0x7f7d23499000+0x3d97d) [0x7f7d234d697d]
[ 31890.973] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => High
** Changed in: xorg-server (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/972852
Title:
X server hangs when connecting or disconnecting external monitor and
input devices
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