Ivan, I think I remember trying the key combo on my netbook and laptop
and neither worked, so I don't this it's related to grabbing.

Well, good news (I think). On my Toshiba Satellite L655, I pulled up
"/var/log/Xorg.0.log", and I seem to have found some source of the error
for this. Here are the last few lines of the file:

[343696.707] BUG: triggered 'if (priv->num_active_touches > priv->num_slots)'
BUG: ../../src/synaptics.c:3123 in UpdateTouchState()
[343696.707] 
Backtrace:
[343696.707] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7f5de0450886]
[343696.707] 1: /usr/lib/xorg/modules/input/synaptics_drv.so 
(0x7f5dda013000+0x2db0) [0x7f5dda015db0]
[343696.707] 2: /usr/lib/xorg/modules/input/synaptics_drv.so 
(0x7f5dda013000+0x364f) [0x7f5dda01664f]
[343696.707] 3: /usr/lib/xorg/modules/input/synaptics_drv.so 
(0x7f5dda013000+0x61b0) [0x7f5dda0191b0]
[343696.707] 4: /usr/bin/X (0x7f5de02c8000+0x8af37) [0x7f5de0352f37]
[343696.707] 5: /usr/bin/X (0x7f5de02c8000+0xb0d2a) [0x7f5de0378d2a]
[343696.707] 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f5ddf5ee000+0xfcb0) 
[0x7f5ddf5fdcb0]
[343696.707] 7: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x13) [0x7f5dde54b003]
[343696.708] 8: /usr/bin/X (WaitForSomething+0x19b) [0x7f5de044dc6b]
[343696.708] 9: /usr/bin/X (0x7f5de02c8000+0x4e5f2) [0x7f5de03165f2]
[343696.708] 10: /usr/bin/X (0x7f5de02c8000+0x3d7ba) [0x7f5de03057ba]
[343696.708] 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) 
[0x7f5dde47f76d]
[343696.730] 12: /usr/bin/X (0x7f5de02c8000+0x3daad) [0x7f5de0305aad]
[343707.298] (II) AIGLX: Suspending AIGLX clients for VT switch

To me, it looks like a stacktrace dump, and it clearly says "BUG" at the
top, referring to the file src/synaptics.c, somewhere in Xorg. Frankly,
I have no idea how to interpret the condition in the "if" statement.

So, I think this is clearly a bug in Xorg, but I don't really know how
to fix this. :(

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/830099

Title:
  Mouse stopped moving - touchpad still responds

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/830099/+subscriptions

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