When it freezes, can you press control-alt-f1 and get to a text
terminal? After that, if you press Ctrl-alt-f7 (could also be f8), do
you get back to the graphical environment, and does it work again?

** Changed in: udev (Ubuntu)
       Status: New => Incomplete

** Package changed: udev (Ubuntu) => linux (Ubuntu)

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Laptop freeze when changing brightness
https://bugs.launchpad.net/bugs/619397
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