This is the issue in hal package as the following script uses /bin/sh,
but should use /bin/bash instead:
/usr/share/hal/scripts/hal-system-lcd-get-brightness
I think thic could be considred for edgy-updates as it is regression and
simple, obvious fix.
** Changed in: gnome-power-manager (Ubuntu)
Sourcepackagename: gnome-power-manager => hal
Importance: Undecided => Medium
Status: Unconfirmed => Confirmed
Target: None => edgy-updates
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[Edgy] PowerManager has no more effect on brightness
https://launchpad.net/bugs/68617
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