Comment 86 for bug 1251042

I have this problem. When I use my touchpad the system hangs after a while, after like 30 seconds of usage usually. I run ubuntu 14.04 with nvidia-prime eg optimus.

When ubuntu hangs I can switch to the virtual consoles and back again and that stops the freezing until I use the touchpad again. The computer is an acer laptop with intel hd graphics and nvidia 640m.