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[Delyan Kalchev <delyank@xxxxxxxxx>]

I've worked a bit on this issue. The www button's behaviour is easily
corrected by setting this keymap to udev:

0x88 www
0xD8 f22 # touchpad toggle
0xD9 f22 # touchpad toggle

The last two rows are for the touchpad on/off button. That did not work
for it. F22 causes a X86TouchpadToggle that turns on and off the
touchpad. The problem is that the button does not generate a "full
sequence" of events - key pressed and then key released but just one
event and the X doesn't detect it correctly. xev doesn't detect it at
all, but actually it manages to turn off the touchpad but it is
impossible to turn it back on later with that button. Here is the output
from evtest:

when pressed to become red:

Event: time 1274786879.758260, type 4 (Misc), code 4 (ScanCode), value d8
Event: time 1274786879.758276, type 1 (Key), code 192 (F22), value 2
Event: time 1274786879.758278, -------------- Report Sync ------------

when pressed to become green:

Event: time 1274786924.131248, type 4 (Misc), code 4 (ScanCode), value d9
Event: time 1274786924.131261, type 1 (Key), code 192 (F22), value 2
Event: time 1274786924.131262, -------------- Report Sync ------------

Output from input-events:

to become red:

14:29:46.188965: EV_MSC code=4 value=216
14:29:46.188979: EV_KEY KEY_F22 (0xc0) pressed
14:29:46.188981: EV_SYN code=0 value=0

to become green:

14:30:18.104408: EV_MSC code=4 value=217
14:30:18.104422: EV_KEY KEY_F22 (0xc0) pressed
14:30:18.104423: EV_SYN code=0 value=0

Even if it worked, it wouldn't be nice either. That is because the
button has its own state - its colour - that would rarely coincide with
the real state since the initial states wouldn't always be the same and
the state of the button may be changed while in terminal (outside X).

The button do not generate any ACPI events.

-- 
LED Stat Problem, Display brightness, resolution
https://bugs.launchpad.net/bugs/584141
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