Interface Compatibility in Linux

[guth]

@GuntherT

You may also need this firmware installed after updating the kernel via backports. The author provides a deb package for it in the Releases at the bottom of the page.

Yes, I’ve already tried that, but it gives me an error!
$ sudo ./scarlett2-firmware_1.0.deb
./scarlett2-firmware_1.0.deb: 2: Syntax error: newline unexpected

I’m going to try compiling the snd-usb-audio-kmod-v6.14.2-f8 kernel modules.

[chiraag-nataraj]

@guth

sudo ./scarlett2-firmware_1.0.deb

You need to do sudo dpkg -i ./scarlett2-firmware_1.0.deb or gdebi-gtk ./scarlett2-firmware_1.0.deb — the latter should prompt for authentication when installing. Or…just double-click on the deb file in your file manager!

[guth]

I expected the MIDI to be class compliant and work right away.
What output do you get from the command aplaymidi -l

?Playing MIDI works, but my axiom25 isn’t sending a signal.

[guth]

@chiraag-nataraj

You need to do sudo dpkg -i ./scarlett2-firmware_1.0.deb or gdebi-gtk ./scarlett2-firmware_1.0.deb — the latter should prompt for authentication when installing. Or…just double-click on the deb file in your file manager!

I’ve compiled the modules and received and installed this firmware scarlett4-firmware_1.0.deb, but the GUI still isn’t ready to start. It’s the one for the 3rd generation, after all.

[chiraag-nataraj]

The GUI supports 4th gen as well, so that’s not the issue. If the driver isn’t detected, perhaps you have to do a modprobe?

[guth]

How can I find out the name of the module? lsmod shows me many.

[chiraag-nataraj]

Sorry, looks like fcp and scarlett2 are both already in the kernel according to this. According to this repo, did you do the following?

sudo systemctl daemon-reload
sudo udevadm control --reload-rules

If so, what’s the output of systemctl cat fcp-server@.service? And if you hit tab after the @, does it auto-complete to a number (1,2,etc) as the repo suggests? What is the status of that invokation of the template?

[guth]

@chiraag-nataraj

If so, what’s the output of systemctl cat fcp-server@.service? And if you hit tab after the @, does it auto-complete to a number (1,2,etc) as the repo suggests? What is the status of that invokation of the template?

Doesn’t look good.

[chiraag-nataraj]

You ran sudo make install on the fcp-support repo after building?

[guth]

@chiraag-nataraj

You ran sudo make install on the fcp-support repo after building?

I simply followed these instructions, nothing else.

Installation Instructions

To build and install the kernel module:

• make sure your system is up to date (probably dnf update or
  apt-get update; apt-get dist-upgrade),
• reboot in case your kernel was updated and you aren’t already
  running it,
• install the kernel headers for your kernel (probably dnf install kernel-devel or apt-get install make linux-headers-$(uname -r)),
• run the following commands from this directory:

KSRCDIR=/lib/modules/$(uname -r)/build
make -j4 -C $KSRCDIR M=$(pwd) clean
make -j4 -C $KSRCDIR M=$(pwd)
sudo make -j4 -C $KSRCDIR M=$(pwd) INSTALL_MOD_DIR=updates/snd-usb-audio modules_install
sudo depmod

• and reboot.

[chiraag-nataraj]

Okay, so…I’m pretty sure you manually installed not necessarily the wrong thing, but something unnecessary (if your device is being deteced already, then the driver is probably already okay). Instead, you should install fcp-support.

[ccaudle (Chris)]

@guth

?Playing MIDI works, but my axiom25 isn’t sending a signal.

Yes, I see in the user manual now that MIDI is intentionally disabled:
"In Easy Start mode, the interface functions at up to 48 kHz sample rate; once you install Focusrite Control 2, you can work at sample rates up to 192 kHz.

The MIDI input and output are also disabled, while Easy Start mode is enabled."

The manual indicates this alternate method to disable Easy Start mode:
If your Scarlett 18i20 is still in Easy Start mode, or you have chosen not to install Focusrite Control 2 to disable Easy Start Mode:

1. Turn off your Scarlett 18i20.
2. Press and hold the 48V button.
3. Keeping the 48V button held, power on your Scarlett 18i20.
4. Wait for the front panel to light up, then release the 48V button.
5. Restart (power off and power on) your Scarlett 18i20.

Your Scarlett powers on with Easy Start disabled.

[guth]

@chiraag-nataraj

Instead, you should install fcp-support.

Okay, I’ll have to take a look at that first. Thank you, my head is buzzing and I’d like to continue tomorrow.

Thank you so much for your dedicated help.