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Ok, lets get this over with.

I have a dual-monitor, ati setup on gnome-shell that was just fine until this morning.

Then, this happened.

Goodness me

Look closer...

Seeing double

Look closely

Whatever has happened to my ubuntu setup? My second monitor still works, entirely normally, with the exception that I cannot (obviously) access activities (as i am in gnome-fallback ). I do wish to resume my work...

EDIT: By entirely normally, I mean I can move my mouse over it and have seperate windows on it and stuff. It's not mirroring.

UPDATE: Unity works entirely normally.

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Not sure if this was solved, but I had very close to the same problem (except for me, Unity wouldn't start either). The trick was to delete xorg.conf:

sudo rm /etc/X11/xorg.conf

And then re-install xorg:

sudo apt-get install --reinstall libgl1-mesa-glx:i386 libgl1-mesa-glx:amd64 libgl1-mesa-dri:i386 libgl1-mesa-dri:amd64 xserver-xorg-core
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Are you using Nvidia graphics? Start up nvidia-settings and go to X Server Display Configuration. Enable TwinView, apply and save to X Configuration File. Restart the computer and it should work.

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I'm using the open-source ati drivers. (Because my card is ATI.) – JXPheonix Aug 12 '12 at 17:02

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