[Trac #929] reproducible touchpad mode switching bug

[Zarro Boogs per Child]

#929: reproducible touchpad mode switching bug
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 Reporter:  ywwg      |       Owner:  mlj      
     Type:  defect    |      Status:  new      
 Priority:  high      |   Milestone:  Untriaged
Component:  hardware  |    Keywords:           
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 I was talking on IRC with Mercury about this, so this may already be being
 addressed.  However I was able to find a way to reproduce this problem
 consistantly.

 Problem: Under some circumstances the touchpad can get "stuck" in PT mode,
 meaning that the cursor appears to stop working for users using their
 fingers.

 Solution: Pressing the touchpad hard or otherwise triggering actual PT
 mode causes the cursor to "wake up" and work in GS mode again.

 To reproduce: This takes a little luck, but it's pretty easy to do.  You
 have to poke the touchpad with your fingernail (toggling PT mode) and then
 immediately start sliding your finger across the pad (as in GS mode).  If
 you do it right, the glide won't work again until you retrigger PT mode.

 Try curling your finger so your nail is on the pad, and then extend your
 finger across the pad so that you scrape it with your nail and then glide
 with your finger.

 Log:  I'll attach a kern.log with i8042 debugging turned on.  The touchpad
 is already stuck at Feb 28 16:44:13, and becomes unstuck at Feb 28
 16:44:16.

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Ticket URL: <http://dev.laptop.org/ticket/929>
One Laptop Per Child <http://laptop.org/>