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I'm on ubuntu 11.04.

I downloaded and installed some updates (I don't know which) through Update Manager yesterday and now my external monitor stopped working. When I connect it to my laptop (thinkpad t420, with intel HD graphics) the laptop screen goes blank and the external screen flickers, shows some random garbage but mostly remains blank.

What should I do? Can I somehow revert updates I have made yesterday? Since everything worked just fine then...

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closed as off topic by fossfreedom May 13 '12 at 16:55

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
You might need to edit your /etc/X11/xorg.conf file. –  Anonymous Oct 25 '11 at 21:28
    
I don't have such a file. –  sol Oct 25 '11 at 21:38
    
This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  coversnail May 13 '12 at 16:45

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