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 -- [Gutsy] guidance-power-manager hangs unless I restart HAL https://bugs.launchpad.net/bugs/145611 You received this bug notification because you are a member of Kubuntu Team, which is a bug contact for kde-guidance in ubuntu. -- kubuntu-bugs mailing list [EMAIL PROTECTED] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs