Now I notice, however, that I can reproduce the fault report if I try to
increase the dimension of the external monitor from 1280×1024 to
something larger.

[  1212.709] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
BUG: ../../dix/getevents.c:850 in scale_to_desktop()
[  1212.709]
Backtrace:
[  1212.715] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7f2068b26846]
[  1212.715] 1: /usr/bin/X (0x7f206899e000+0x622fe) [0x7f2068a002fe]
[  1212.715] 2: /usr/bin/X (0x7f206899e000+0x62f6d) [0x7f2068a00f6d]
[  1212.715] 3: /usr/bin/X (GetPointerEvents+0xe4) [0x7f2068a02304]
[  1212.715] 4: /usr/bin/X (0x7f206899e000+0x1730a6) [0x7f2068b110a6]
[  1212.715] 5: /usr/bin/X (miPointerWarpCursor+0xe7) [0x7f2068b11527]
[  1212.715] 6: /usr/bin/X (0x7f206899e000+0x871b1) [0x7f2068a251b1]
[  1212.715] 7: /usr/bin/X (0x7f206899e000+0x173a7c) [0x7f2068b11a7c]
[  1212.715] 8: /usr/bin/X (0x7f206899e000+0x112183) [0x7f2068ab0183]
[  1212.715] 9: /usr/bin/X (0x7f206899e000+0xfd06e) [0x7f2068a9b06e]
[  1212.715] 10: /usr/bin/X (RRPointerScreenConfigured+0x75) [0x7f2068a9b295]
[  1212.716] 11: /usr/bin/X (RRScreenSizeNotify+0x124) [0x7f2068a9d774]
[  1212.716] 12: /usr/bin/X (0x7f206899e000+0xc9876) [0x7f2068a67876]
[  1212.716] 13: /usr/bin/X (ProcRRSetScreenSize+0x1e1) [0x7f2068a9dc81]
[  1212.716] 14: /usr/bin/X (0x7f206899e000+0x4e8a1) [0x7f20689ec8a1]
[  1212.716] 15: /usr/bin/X (0x7f206899e000+0x3d7ba) [0x7f20689db7ba]
[  1212.716] 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) 
[0x7f2066b5976d]
[  1212.716] 17: /usr/bin/X (0x7f206899e000+0x3daad) [0x7f20689dbaad]
[  1212.716] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
...

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Fix Released => Confirmed

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Confirmed => New

** Summary changed:

- Xorg freezes at login; Xorg.log contains "BUG: triggered 'if (!dev->valuator 
|| dev->valuator->numAxes < 2)'"
+ Xorg.log contains "BUG: triggered 'if (!dev->valuator || 
dev->valuator->numAxes < 2)'"

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https://bugs.launchpad.net/bugs/1029305

Title:
  Xorg.log contains "BUG: triggered 'if (!dev->valuator ||
  dev->valuator->numAxes < 2)'"

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