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I am also having a similar problem, my trackpad does not work all of a
sudden, and there are bugs in the Xorg file similar to the above.  I
have attached my Xorg.0.log

** Attachment added: "Xorg.0.log"
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1424888/+attachment/4484057/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1424888

Title:
  BUG triggered in exevents in xorg logs

Status in xorg-server package in Ubuntu:
  New

Bug description:
  I have a Surface Pro 3, and I'm using evdev to use it. While looking
  to tackle another issue (my trackpad suddenly stopped working), I
  noticed this in the xorg log:

  [  3479.176] (II) XINPUT: Adding extended input device "Microsoft Surface Type Cover" (type: KEYBOARD, id 8)
  [  3479.176] (**) Option "xkb_rules" "evdev"
  [  3479.176] (**) Option "xkb_model" "pc105"
  [  3479.176] (**) Option "xkb_layout" "us"
  [  3479.176] (WW) evdev: Microsoft Surface Type Cover: touchpads, tablets and touchscreens ignore relative axes.
  [  3479.176] (EE) BUG: triggered 'if (axnum >= dev->valuator->numAxes)'
  [  3479.176] (EE) BUG: ../../Xi/exevents.c:2086 in InitValuatorAxisStruct()
  [  3479.176] (EE) 
  [  3479.176] (EE) Backtrace:
  [  3479.176] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f8c9d098f76]
  [  3479.176] (EE) 1: /usr/bin/X (InitValuatorAxisStruct+0x67) [0x7f8c9d0280c7]
  [  3479.176] (EE) 2: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x51c2) [0x7f8c947721c2]
  [  3479.176] (EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x5406) [0x7f8c94772406]
  [  3479.176] (EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x7088) [0x7f8c94774088]
  [  3479.177] (EE) 5: /usr/bin/X (ActivateDevice+0x4a) [0x7f8c9cf2e50a]
  [  3479.177] (EE) 6: /usr/bin/X (0x7f8c9cee2000+0xa4d91) [0x7f8c9cf86d91]
  [  3479.177] (EE) 7: /usr/bin/X (0x7f8c9cee2000+0xbb8e9) [0x7f8c9cf9d8e9]
  [  3479.177] (EE) 8: /usr/bin/X (0x7f8c9cee2000+0xbbc28) [0x7f8c9cf9dc28]
  [  3479.177] (EE) 9: /usr/bin/X (WakeupHandler+0x6b) [0x7f8c9cf3e24b]
  [  3479.177] (EE) 10: /usr/bin/X (WaitForSomething+0x1c7) [0x7f8c9d096327]
  [  3479.177] (EE) 11: /usr/bin/X (0x7f8c9cee2000+0x57311) [0x7f8c9cf39311]
  [  3479.177] (EE) 12: /usr/bin/X (0x7f8c9cee2000+0x5b706) [0x7f8c9cf3d706]
  [  3479.177] (EE) 13: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f8c9ac37ec5]
  [  3479.177] (EE) 14: /usr/bin/X (0x7f8c9cee2000+0x45a8e) [0x7f8c9cf27a8e]
  [  3479.177] (EE) 
  [  3479.177] (EE) BUG: triggered 'if (axnum >= dev->valuator->numAxes)'
  [  3479.177] (EE) BUG: ../../Xi/exevents.c:2119 in SetScrollValuator()
  [  3479.177] (EE) 
  [  3479.177] (EE) Backtrace:
  [  3479.177] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f8c9d098f76]
  [  3479.177] (EE) 1: /usr/bin/X (SetScrollValuator+0x76) [0x7f8c9d027ea6]
  [  3479.177] (EE) 2: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x51ee) [0x7f8c947721ee]
  [  3479.177] (EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x5406) [0x7f8c94772406]
  [  3479.177] (EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f8c9476d000+0x7088) [0x7f8c94774088]
  [  3479.177] (EE) 5: /usr/bin/X (ActivateDevice+0x4a) [0x7f8c9cf2e50a]
  [  3479.177] (EE) 6: /usr/bin/X (0x7f8c9cee2000+0xa4d91) [0x7f8c9cf86d91]
  [  3479.177] (EE) 7: /usr/bin/X (0x7f8c9cee2000+0xbb8e9) [0x7f8c9cf9d8e9]
  [  3479.177] (EE) 8: /usr/bin/X (0x7f8c9cee2000+0xbbc28) [0x7f8c9cf9dc28]
  [  3479.177] (EE) 9: /usr/bin/X (WakeupHandler+0x6b) [0x7f8c9cf3e24b]
  [  3479.177] (EE) 10: /usr/bin/X (WaitForSomething+0x1c7) [0x7f8c9d096327]
  [  3479.177] (EE) 11: /usr/bin/X (0x7f8c9cee2000+0x57311) [0x7f8c9cf39311]
  [  3479.177] (EE) 12: /usr/bin/X (0x7f8c9cee2000+0x5b706) [0x7f8c9cf3d706]
  [  3479.177] (EE) 13: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f8c9ac37ec5]
  [  3479.177] (EE) 14: /usr/bin/X (0x7f8c9cee2000+0x45a8e) [0x7f8c9cf27a8e]
  [  3479.177] (EE) 
  [  3479.178] (II) evdev: Microsoft Surface Type Cover: initialized for absolute axes.
  [  3479.178] (**) Microsoft Surface Type Cover: (accel) keeping acceleration scheme 1
  [  3479.178] (**) Microsoft Surface Type Cover: (accel) acceleration profile 0
  [  3479.178] (**) Microsoft Surface Type Cover: (accel) acceleration factor: 2.000
  [  3479.178] (**) Microsoft Surface Type Cover: (accel) acceleration threshold: 4

  I have the similar lines in the beginning of the log also (with
  timestamp around 5), and I don't understand why all this is repeated
  here also.

  I suffer also from:
  https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/954426

  Trying to switch to console mode then come back doesn't trigger these
  lines.

  This report is only about this BUG behing logged into Xorg file. But
  it might be of interest of noting that I'm chasing an sudden issue
  with my typecover : the trackpad stopped working. For now, this is
  probably unrelated.

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