Hi Robert, I'm sorry you're having difficulties in applying my
workaround to your environment.

I suggest you try to find out whether halevt functions properly by
running it in the foreground:

$ sudo /etc/init.d/halevt stop
$ sudo -u halevt halevt -fig plugdev

Now if you press the brightness buttons you should see hal events on
your screen. In my case this is something like:

Condition: 
/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port_logicaldev_input,ButtonPressed
 (brightness-down)
Condition: 
/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port_logicaldev_input,ButtonPressed
 (brightness-up)

If that's the case then please check again whether you've really
correctly edited both (halevt and sudo) configuration files to represent
your local file paths and server name. You might have to read the
corresponding man pages. (Sorry if I'm explaining the obvious, you
probably did that already...)

If the events look differently then you may have to change your
halevt.xml accordingly. If you don't get any events then - bad luck. You
won't be able to use my workaround. At least not without further
investigation why the events are not triggered. I didn't have to
configure anything to get the HAL events.

Finally don't forget to switch your halevt daemon back on:
$ sudo /etc/init.d/halevt start

If you've checked all that and it still doesn't work then I'm afraid
I've no clue where you could look further. :-(

-- 
Brightness adjustment doesn't work for HP ProBook 4720s
https://bugs.launchpad.net/bugs/592592
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