When you go to change the rotation for your screen**, there is not a
dialog that pops up asking if you are sure of your changes. I had
accidentally changed my monitor to rotate 90-degress. The screen went
black, and I was unable to use my desktop unless I switched to a `tty`
window to fix what went wrong.
The reason why rotation did not work is because the Radeon driver does
not currently support acceleration for my device.
Here is the message from Xorg.0.log:
>>> (EE) RADEON(0): Rotation requires acceleration!
**This will probably only be reproducible if your graphics driver does
not support acceleration or if you have acceleration disabled!
I am using kernel 3.14-1-amd64 #1 SMP Debian 3.14.7-1 (2014-06-16)
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