I just wondered if my Frisby external sound card works on Ubuntu. First i googled for any linux driver of Frisby 5.1 Soundbox, but unfortunately there was not. So i just thought about if it directly works via Alsa without any extra installation or configuration? And yes, it happened exactly like that! After a few tryouts, [...]

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First of all, we will see which outputs are available, connected/disconnected with xrandr –verbose command:
black@sysbuntu:~$ xrandr –verbose
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 2720 x 900
LVDS connected 1280×800+0+0 (0×4f) normal (normal left inverted right x axis y axis) 0mm x 0mm
Identifier: 0×4b
Timestamp: 12612
Subpixel: horizontal rgb
Clones:
CRTC: [...]