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When I start up my PC, I see strange artefacts on the login screen,
pressing keys causes the artefacts to change (for instance pressing 'H'
causes a few more white spots to appear, and pressing backspace causes
them to disappear). Half the time when I log in, it either freezes and
fails to log in or it crashes and restarts the login screen.

I am using a standard Ubuntu 12.04 that is up to date (as of 21 May
16h30) but I do have the nvidia restricted drivers activated.

As an aside, I have another machine which is 11.10 which also gets
artefacts on the login screen, but pressing enter causes the login
screen to restart and they go away. On 12.04 this is not the case. The
other machine is also using the nvidia restricted drivers.

I don't know which logs to attach, so let me know. It is fairly
reproduceable.

** Affects: unity-greeter (Ubuntu)
     Importance: Undecided
         Status: New

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login screen has erratic behaviour and visual artefacts
https://bugs.launchpad.net/bugs/1002318
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