I have just installed Ubuntu 13.04 on my Dell Inspiron N5010.
Whenever I press the display brightness button, the OS hangs up
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Check out your syslog after the reboot to try to isolate what it called and try this out ...
What is the equivalent of 'Control-Alt-Delete'?
Other possibilities: https://unix.stackexchange.com/questions/12107/how-to-unfreeze-after-accidentally-pressing-ctrl-s-in-a-terminal How do I stop Ubuntu Precise freezing/hanging
