Focusrite Scarlett 18i20 Gen 2 ALSA mixer driver Test 1

Test 1 of Focusrite Scarlett 18i20 Gen 2 ALSA mixer driver. To install (if you don't want to build from source):

• Fedora: sudo rpm -ivh kernel-5.0.0s1+-4.x86_64.rpm
• Ubuntu: sudo dpkg -i linux-image-5.0.0s1_5.0.0s1-1_amd64.deb linux-headers-5.0.0s1_5.0.0s1-1_amd64.deb

Then reboot and make sure to select the new kernel: sudo reboot

alsamixer -cUSB should show a whole lot more controls:

• Master volume knob indicator
• Volume controls for the 10 analogue HW outputs
• HW/SW volume switches for the 10 analogue HW outputs
• Output mux (where the sound for the HW outputs comes from; defaults to PCM outputs 1-20)
• Capture mux (where the sound for PCM recording comes from; defaults to HW inputs 1-18)
• Matrix mux (where the sound going into the mixer comes from; 18 inputs default off)
• Mixer matrix (18 inputs * 10 outputs = 180 controls)
• Mute and dim indicators

Also of note:

• The output, capture, and matrix muxes each have all inputs available to them (HW inputs, PCM outputs, and matrix outputs)
• The driver cannot load the configuration from the hardware so best to use alsactl store and alsactl restore to keep a copy of your configuration if you want to change the configuration later
• The driver will not reset the hardware configuration when it loads (only once you change something e.g. in alsamixer, and then only that bank of controls)