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When booting my computer I am first presented with the regular lightdm login screen except there are some graphical anomalies in the top 5th of the screen. When I press a key on the keyboard the graphical the anomalies change in a similar fashion to The Matrix code. Probably the best way to explain what this looks like is having a few characters (similar to what you get when you open a binary file in a text editor but in small font) being overlaid on the login screen. When I press more keys it's as if those events are being written into the screen buffer and I'm looking directly at a memory map. This even happens when I press 'shift'.

Once I enter my password the screen flashes and I have another lightdm login screen but this time without the anomalies. On entering my password again I can login to unity and everything seems fine.

I am running the 64-bit version of Oneiric Ocelot with Nvidia 280.13 drivers. It has only started within the last week or so, which corresponds to when I was installing software to allow screen rotation and also a large set of software centre updates (including kernel update).

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closed as too localized by Mark Rooney, Jjed, Ringtail, fossfreedom Mar 27 '12 at 20:55

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
you can add this as an answer, so it will help others in the future. –  RolandiXor Nov 2 '11 at 22:15
    
Thanks but upon reboot it's doing it again. I have removed the comment now as this hasn't been resolved. –  Mark Jones Nov 2 '11 at 23:02
    
I have a similar problem. Using 11.10 64bit with nVidia drivers.. I have no artefacts or anomalies, however every time the system is started I have to log in twice. However if I log out and log back in it takes my credentials the first time. –  rlemon Jan 16 '12 at 17:23
    
Good, I'm glad I wasn't alone with this. I have since enabled automatic login for the machine exhibiting this problem which has hidden the problem from view. –  Mark Jones Jan 16 '12 at 21:10
    
What to do with questions that describe known bugs? this has been reported on Launchpad and as such is now closed. –  Mark Rooney Mar 24 '12 at 0:13

protected by Community Jan 27 '12 at 14:50

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