[Bug 513921] Re: keys for adjusting display brightness don't work as expected on ASUS 1005p and 1001p netbook

[Rolf Leggewie]

Upon Zhang's request in the upstream ticket I reran the hotkey
troubleshooting steps from the wiki.  It now turns out this may be a
Gnome bug after all?

Tthe backlight changes brightness when the hotkeys are pressed, but it's
changing non-linear, seemingly erratic.  When I press the hotkeys, the
value in /sys/class/backlight/acpi_video0/actual_brightness decreases
and increases monotonically by a value of 2 per press.  Maximum is 15,
minimum is 0.  So, you might see 10-12-14-15-13-11 or 3-1-0-2-4.  The
real display brightness does not seem to have anything to do with it.
When I reran the test with xev and sed from
https://wiki.ubuntu.com/Hotkeys/Troubleshooting and pressing the Hotkeys
a few times, this is what I got

keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x0
keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 64 = (keysym 0xffe9, Alt_L), state = 0x0

Keypresses appear double, IOW, I press up once and down once before closing xev
with Alt+F4.

-- 
keys for adjusting display brightness don't work as expected on ASUS 1005p and 1001p netbook
https://bugs.launchpad.net/bugs/513921
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