I have installed Xubuntu 11.04 on a HP Probook 4510S and the FN Keys of brightness only works when i on the login screen (gdm). Until i enter to my desktop the FN Keys stop Working. This is a XFCE Issue? I have another Laptop, a IBM THinkpad X40, with the same Xubuntu 11.04 and the FN Keys works perfect! Even the keyboard light Works! I think this is a ACPI related problem, i google it the problem with out a specific issue like this. The only thing that i can do it is use of xbacklight when i'm on my session. root@xavierc-lt-xub:~# ls /proc/acpi/ ac_adapter battery button event wakeup root@xavierc-lt-xub:~#
Definitely it's seems a XFCE issue, i just install Gnome on XUBUNTU and all FN keys Works...:(
Not an xfdekstop issue... GNOME probably handles the brightness keys via gnome-settings-daemon or gnome-power-manager. Not sure where we should handle this, if at all.
Xfce4-power-manager handles those keys, and reading from this bug, I doubt if this daemon was running or gpm was started.
This bugreport is really old and the brightness keys are indeed handled by xfce4-power-manager, unless they aren't recognized by the system at all (i.e. even "xev" won't give any feedback on them). If this bug really still exists, please comment and we can re-open it. Meanwhile I'm closing it as invalid.