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[indium <780357@xxxxxxxxxxxxxxxxxx>]

I'm having a similar problem, but for me it happens mostly in a certain
sequence: I switch off the touchpad because an external mouse is
attached (via xinput). Switching back on works. Then I put my macbook
pro 6,2 to sleep and unplug the mouse. When I resume working (without
the external mouse) the internal mouse is sometimes locked (which I can
unlock via xinput), but sometimes nothing works (not xinput, not
synclient).

Then, your modprobe trick works.

That is the last resort, and xinput, gpointing-device-settings and
synclient don't help.

Xinput and synclient see the same properties and the same settings. I
can change these properties, but the mouse doesn't respond to my finger
moving over the pad.

gpointing-device-settings changes these properties as well, but doesn't
read the values 'real-time' when I change them via xinput or synclient.

TAPPING and CLICKING and TWO-FINGER scrolling DO WORK (i.e. xev reports
these).

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https://bugs.launchpad.net/bugs/780357

Title:
  MacBook Pro touchpad randomly stops working, needs module reload

Status in Mactel Support:
  New

Bug description:
  I've got a Macbook Pro 6,2 that runs Ubuntu 11.04.
  It randomly happens - let's say every hour - that the touchpad stops working. The pointer freezes but cliking and double clicking is still possible. 

  The ugly workaround is to open a terminal, remove the module and load it again:
  sudo modprobe -r bcm5974
  sudo modprobe bcm5974

  This did not happen with 10.10
  I will now attach dmesg output. If you need some logs, just tell me.

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