This is clearly a bug in HAL. It looks like that HAL sometimes does not
properly detect brightness levels, leaving it to huge number, as seen in
lshal-before.log:
laptop_panel.num_levels = 134648572 (0x80692fc) (int)
This confuses guidance-power-manager, which wants to show that many
levels of brightness. See also similar bug 139205 and bug 138956
** Changed in: hal (Ubuntu)
Importance: Undecided => Medium
Status: New => Confirmed
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[Gutsy] guidance-power-manager hangs unless I restart HAL
https://bugs.launchpad.net/bugs/145611
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