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I've got a Samsung Notebook (NP-QX412-S01AU) with a touchpad / clickpad. I'm running 12.04 Precise. When I first log into my computer, the touchpad behaves exactly as expected and desired. The longer I stay logged in, it slowly degrades. I'll try describe it.

There are 3 ways of "dragging" on this clickpad:

  1. (Physical) click and hold with one finger, and drag around while still holding it down. All with one finger.
  2. (Physical) Click and hold with one finger, then with another finger drag around to move cursor.
  3. Double tap (not a physical click) and on the second tap, hold and drag.

I most naturally use option 1, but here's how it works:

  • When I first turn on, options 1, 2 and 3 all work.
  • After a while, only options 2 and 3 work.
  • Later still, only option 3 works.
  • Restarting X causes all 3 to work again.

I've compared the output of "synclient" in each of the states, and there was no difference. Anybody know what to look at?

Or at the very least, a command I can run to "restart" the mouse driver without restarting X?

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Try modprobe -r psmouse then modprobe psmouse proto=imps. This could cause Unity to crash but it restarts right away and everything is back to normal in a few seconds. This is what I do to enable the touchpad when it's not working on login. This has been happening to me on Ubuntu 12.04 and on 11.10. –  Marky Jun 27 '12 at 6:22
    
Thanks! That takes care of the "restart" trick. I'll leave the question open in case anyone comes up with an actual solution, but this is great for now. Much appreciated! –  Jason O'Neil Jun 28 '12 at 1:32

2 Answers 2

From the terminal (Ctrl+Alt+t), run the following command:

sudo modprobe -r psmouse && sudo modprobe psmouse proto=imps

Synaptic touchpad on laptop not working

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Thanks for the comment. For me I haven't had the problem in so long that I can't reproduce it to check if your solution works, which I suppose is a good problem to have :) I hope your answer helps someone else though, so I'm giving it an upvote. –  Jason O'Neil Mar 6 '13 at 3:31
    
This fixed the left click and drag issue with my dell 7537. Cheers. :) –  duck May 5 at 11:44
up vote 1 down vote accepted

Answering my own question in case anyone has the same problem.

The solution mentioned in the comment by Marky did get the touchpad to drag/drop again, but it prevented any multi-touch from working, so 2 Finger Scroll, 2 Finger Right Click etc stopped working. While using Unity 2D I kept restarting Xorg (log out, log back in) whenever I had issues with the mouse.

The fix in the end was unexpected: upgrading to Unity 3D. I have not had the problem since switching. I assume something in Unity 2D's suspend/resume calls is breaking the touchpad functionality.

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