I use 12.04 and an old HP Probook 4515s. Every time I start the PC, everything works fine but after about 20 minutes, my mouse freezes. Neither the PC nor any program works, just the cursor.
What can I do?
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This used to be a problem and at the time it turned out you need to disable touchpad tracking while typing. A solution was found, but I am unsure whether the same solution will work for you. Worth a try though. Run
synclient TouchpadOff=0. This solution can be seen at this forum.