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HPZBook Studio G3 laptop running an uptodate arch linux. Screen backlight controls in Gnome3 appearently do nothing, the /sys/class/backlight/acpi_video0/* interface has no visible change either (though it shows the backlight set via Gnome controls). As discovered accidentally, after suspending my laptop and resuming it one time after a fresh boot, everything backlight-related works perfectly.
How could I reach the desired state without an initial suspend? What could be different after resuming the machine?
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strange, you seem to have the opposite problem as me: https://bbs.archlinux.org/viewtopic.php?id=210204 :-)
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