I'm not entirely sure this is the exact same bug, however it seems that
it is -- excepting that, in xev, I only get events when I hit the
brightness adjusting keys.

In feisty, the behaviour of brightness on my machine was:
   On pressing brightness-up (fn-uparrow, fn-downarrow), I got random behaviour.

In gutsy, now, the behaviour is:
 * For brightness-up and down, xev reports a keypress/keyrelease event.
 * Nothing happens.
 * Keycode 101 on brightness down, and keycode 212 on brightness up.
 * XFilter event returns false

Interestingly, while I've heard that /proc/acpi/video/VGA/LCD/brightness
should deal in values from 1-8 (I don't know if that's accurate or not),
I get the following output from catting brightness:

/proc/acpi/video/VGA/LCD# cat brightness 
levels:  100 37 12 25 37 50 62 75 87 100
current: 87

100 is listed twice.
100 is not  a valid value. (bash: echo: write error: Invalid argument)
37 is listed twice.
37 is a valid value.
Brightness increases/decreases only on the specific values listed, within the 
range of 12 to 87.

My particular issue seems to be a kernel/video issue (or that that's a
part of my issue) but that's a filtered group, so I can't post bugs
there.

If this is a separate bug, I'll open a new report.

pastebin of xev output:
http://paste.ubuntu-nl.org/38132/


** Changed in: gnome-power-manager (Ubuntu)
       Status: New => Confirmed

-- 
lcd brightness down doesn't work when gpm running (t60)
https://bugs.launchpad.net/bugs/123548
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