I am running a GNOME 3 fallback desktop in Debian testing, and I removed some
pulseaudio packages, for I don't need the advanced functionality. That resulted in my multimedia keys that control speaker volume to work no more. This forces me to use a mouse on the classic volume control applet to control the volume, which isn't always convenient.
Here's what I get:
$ acpi_listen button/volumedown VOLDN 00000080 00000000 K button/volumeup VOLUP 00000080 00000000 K
note: the other Fn keys (brightness, suspend, ...) work okay