I have Thinkpad Edge E125 running Debian stable / Gnome 2
Pulseaudio handles sound.
When I hit volume controls on the laptop, gnome displays volume bar window decreasing or increasing volume.
However volume is not actually changed.
Whenever I use the applet to change volume it works.
It's not obvious ACPI problem, so I'm a bit confused.
Requesting for help, please :)
UPD: other hotkeys, such as display highlight or media works