Ubuntu updates just broke the operating system, it now fails to recognise the monitor and its display resolutions; How do I roll back this update?
closed as not constructive by Jorge Castro, Nathan Osman, gertvdijk, Thomas W., Kevin Bowen Apr 9 '13 at 0:29
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What is your video card model ?
You should be able to reconfigure your xorg with this command:
you can try to use mesa module if you are not sure ..
I had a similar issue a couple weeks ago. After a while I discovered that an additional hardware driver got auto activated after the update.
I solved it by simply DEACTIVATING all Additional Drivers.
This should be fairly secure since open source drivers will work.
To try it out do the following:
Gear menu > System Settings > Additional Drivers > THEN deactivate any active (green) driver that you find. They all should be deactivated (Gray) just like in the image below.