Felicia uses pulseaudio and you need to set it to use 6 channels. This is how you do it:
1. open /etc/pulse/daemon.conf as root
- with command:
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sudo gedit /etc/pulse/daemon.conf
and you'll be asked for you password
- graphically: go to /etc, open the pulse folder as root by right clicking on it and then just open the daemon.conf file for editing
2. scroll down to the place where you see something like:
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; default-sample-format = s16le
; default-sample-rate = 44100
default-sample-channels = 6
3. As you can see, put 6 as the value for default-sample-channels and make sure there is no semicolon in the beginning of the line!
4. after reboot or even loging out and in again you should be able to have 5.1 sound.
5. you might also want to change settings in the Volume Control:
- double click the speaker icon on the notification area,
- make sure the device chosen is Alsa Mixer (on my system it's SiS SI7012 (Alsa mixer)),
- open preferences ,
- make sure the following are ticked: Master, PCM, Surround, Centre, LFE, Surround Jack Mode and Channel Mode (there will be other things ticked as well, since they don't matter in this context I'm not mentioning them) and close the preferences window,
- see to that none of those I mentioned are muted,
- go to the options tab and set Surround Jack Mode to Independent and Channel Mode to 6ch.
You should be done now and ready to enjoy your surround system.
if your keyboard has volume up and down buttons you can use them for global volume (not only front speakers) if you set the following:
- go to Menu/Preferences/Sound
- on the Devices tab set the device to PulseAudio Mixer under Default Mixer Tracks (on my system the device is called: "Playback:ALSA PCM on surround51:0 (SiS SI7012) via DMA (PulseAudio Mixer)")
- mark Master in the window below the device chooser.