Comment 12 for bug 927168

Possible work around: Changing screen resolution ??

I first encountered the problem when I was in the process of installing a big pile of
updates using aptitude... (see Bug #1040774)

    Then the UI began behaving all wacky. Everything started flashing
    black every time I moved the mouse. Menus were positioned in the wrong
    places, Could not reposition windows on the UI. It was very difficult
    to see the windows inside the GU layers. This made Quantal practically unusable
    because because it would only correctly respond to about 1% of the mouse clicks.

It turns out that during the upgrade my screen resolution was changed to 3840x1920 ( the first one in the pick list). I run Quantal on VMware® Workstation 8.0.4 build-744019. In the Systems-Settings => Displays I now see 'Laptop' where I used to see 'Unknown'. Perhaps this is the new default.

Anyway after editing the xorg.conf file with nano and setting the display resolution back to 1920 x 1200 - everything seems fine.