I had similiar problems with ubuntu 13.04 on an Acer Iconia Tab W500. The patches in https://bugs.freedesktop.org/show_bug.cgi?id=56578#c17 solved the problem for me.
I had similiar problems with ubuntu 13.04 on an Acer Iconia Tab W500. /bugs.freedeskt op.org/ show_bug. cgi?id= 56578#c17 solved the problem for me.
The patches in https:/