I confirm this on Ubuntu 10.04
To me it does not happen 100% of the times, but pretty often.
As a workaround I unplug and plug the AC cable, it always works.
There are A LOT of issues with very similar descriptions, probably
duplicates.
** Changed in: hal (Ubuntu)
Status: New => Confirmed
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10.04 - Screen brightness is dim after suspended mode
https://bugs.launchpad.net/bugs/559936
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