Please try the 'xbacklight' command. And see also
https://bugzilla.gnome.org/show_bug.cgi?id=688052
** Also affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: GNOME Bug Tracker #688052
https://bugzilla.gnome.org/show_bug.cgi?id=688052
** Also affects: gnome-power via
https://bugzilla.gnome.org/show_bug.cgi?id=688052
Importance: Unknown
Status: Unknown
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Confirmed
** Changed in: gnome-power-manager (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1720438
Title:
brightness control broken nvidia
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