Here's a thread in the linux-thinkpad mailing list about this issue (it affects
XFCE as well as GNOME):
http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2012-February/050576.html
The thinkpad-acpi kernel module maintainer says:
> This typically means broken crap that reacts to brightness *change* events as
> if they were keypresses.
Upstream bugs that seem related to this:
- ThinkPad X60s and X300, improper brightness adjustment using function keys
Fn+{Home,End}, twice long step
https://bugzilla.gnome.org/show_bug.cgi?id=579224
- Need a setting to tell g-p-m that brightness changes are handled in hardware
when using xrandr
https://bugzilla.gnome.org/show_bug.cgi?id=601410
** Bug watch added: GNOME Bug Tracker #579224
https://bugzilla.gnome.org/show_bug.cgi?id=579224
** Bug watch added: GNOME Bug Tracker #601410
https://bugzilla.gnome.org/show_bug.cgi?id=601410
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Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/527157
Title:
Brightness controls skips Levels.
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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/527157/+subscriptions
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