Development
To actually try modifying the driver source code, and build your modification against your current running kernel, do this (don't worry - the outcome stays in this directory):
make -C /lib/modules/`uname -r`/build M=`pwd`/sound/usb clean
make -C /lib/modules/`uname -r`/build M=`pwd`/sound/usb modules
Untested Something like this would install the newly built modules in your system against your current kernel. You might want to do make -n to see where the command put the modules:
make -C /lib/modules/`uname -r`/build M=`pwd`/sound/usb modules_install
The linux kernel prefers to load modules under /lib/modules/*/updates and /lib/modules/*/extra over elsewhere under /lib/modules/*, so it is safer to manually copy new *.ko into those directories, and run depmod -a to let the kernel rescan them, rather than doing make ... modules_install.
The v5.12-sound-master branch tracks the linux kernel sound maintainer Takashi's tree. The v5.12-dev branch tracks Vladimir / sadko4u 's. The v5.12-scarlett-gen3 branch tracks Geoffrey Bennett's scarlett-gen3 development. They can be accessed by the instructions below, replacing v5.12-sound-master by v5.12-dev or v5.12-scarlett-gen3:
git clone -b v5.12-sound-master https://github.com/Focusrite-Scarlett-on-Linux/sound-usb-kernel-module.git
cd sound-usb-kernel-module
make -C /lib/modules/`uname -r`/build M=`pwd`/sound/usb clean
make -C /lib/modules/`uname -r`/build M=`pwd`/sound/usb modules
# copy all the *.ko from under sound/usb into /lib/modules/`uname -r`/updates ; see the README
depmod -a
depmod -v -a (with -v) gives rather verbose messages about kernel modules. You should find those new ones being processed.
Also remember to create a /etc/modprobe.d/scarlett.conf with device_setup=1 option for the device as in the detailed instruction, duplicated further below.
After reboot, if you run dmesg, you should see Focusrite Scarlett Gen 2/3 Mixer Driver enabled [sadko4u mod] ... for one, and Focusrite Scarlett Gen 2/3 Mixer Driver enabled v5.12.9s1 ... for the other.
If your kernel has CONFIG_MMODULE_SIG_FORCE=y (most secure-boot distribution kernels are), you will need to have a pair of certs/signing_key.pem and certs/signing_key.x509, acceptable to your current BIOS, to sign the kernel modules.
Add a single line #define DEBUG 1 to the top of sound/usb/mixer_scarlett_gen2.c, to enable some rather noisy debug messaging code, if needed.
Enabling new functionality at load time
You need to enable the driver at module load time with the device_setup=1 option to insmod/modprobe. Create a new file /etc/modprobe.d/scarlett.conf, with the following one-line content:
Gen 2:
- 6i6:
options snd_usb_audio vid=0x1235 pid=0x8203 device_setup=1 - 18i8:
options snd_usb_audio vid=0x1235 pid=0x8204 device_setup=1 - 18i20:
options snd_usb_audio vid=0x1235 pid=0x8201 device_setup=1
Gen 3:
- Solo:
options snd_usb_audio vid=0x1235 pid=0x8211 device_setup=1 - 2i2:
options snd_usb_audio vid=0x1235 pid=0x8210 device_setup=1 - 4i4:
options snd_usb_audio vid=0x1235 pid=0x8212 device_setup=1 - 8i6:
options snd_usb_audio vid=0x1235 pid=0x8213 device_setup=1 - 18i8:
options snd_usb_audio vid=0x1235 pid=0x8214 device_setup=1 - 18i20:
options snd_usb_audio vid=0x1235 pid=0x8215 device_setup=1
Or you can use the sledgehammer: options snd_usb_audio device_setup=1,1,1,1 to pass that option to the first 4 USB audio devices.
2 Oct 12, 2021
157 Jan 2, 2023
3 Sep 20, 2022
4 Feb 17, 2022
29 Jul 16, 2022
330 Jan 2, 2023
18 Oct 2, 2022
212 Dec 30, 2022
72 Dec 26, 2022
68 Jan 5, 2023
103 Dec 4, 2022
47 Dec 23, 2022
6 Aug 30, 2022
19 Dec 15, 2022
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25 Dec 21, 2022
177 Dec 30, 2022