[SOLVED] SND_USB_AUDIO

slac-in-the-box · 06-12-2023, 12:59 PM

In slackware-aarch64:

Code:

root@papaz:/boot >>> grep USB config-armv8-6.1.21 | grep SND
CONFIG_SND_USB=y
# CONFIG_SND_USB_AUDIO is not set
# CONFIG_SND_USB_UA101 is not set
# CONFIG_SND_USB_CAIAQ is not set
# CONFIG_SND_USB_6FIRE is not set
# CONFIG_SND_USB_HIFACE is not set
# CONFIG_SND_USB_POD is not set
# CONFIG_SND_USB_PODHD is not set
# CONFIG_SND_USB_TONEPORT is not set
# CONFIG_SND_USB_VARIAX is not set

My usb headset wants CONFIG_SND_USB_AUDIO to be set.

Trying to understand the way slackware-aarch64 handles initrd:

If I add

Code:

modprobe SND_USB_AUDIO

to /boot/local/load_kernel_modules.post

is the initrd system going to go to the kernel source and compile that module?

business_kid · 06-12-2023, 03:06 PM

No. The OS is not clairvoyant, and that sort of "I know better than you" by the OS is not the Slackware way..

If snd_usb_audio is not compiled in, (which it isn't, from your post) You'll have to take your kernel config, edit it to include snd_usb_audio, and recompile from scratch. Enjoy!

mralk3 · 06-16-2023, 09:41 AM

Code:

CONFIG_SND_USB=y
# CONFIG_SND_USB_AUDIO is not set
# CONFIG_SND_USB_UA101 is not set
# CONFIG_SND_USB_CAIAQ is not set
# CONFIG_SND_USB_6FIRE is not set
# CONFIG_SND_USB_HIFACE is not set
# CONFIG_SND_USB_POD is not set
# CONFIG_SND_USB_PODHD is not set
# CONFIG_SND_USB_TONEPORT is not set
# CONFIG_SND_USB_VARIAX is not set

Next week's batch of updates will include those configuration options in the kernel. Thanks for pointing them out.

Quote:

Originally Posted by slac-in-the-box

Trying to understand the way slackware-aarch64 handles initrd:

If I add

Code:

modprobe SND_USB_AUDIO

to /boot/local/load_kernel_modules.post

is the initrd system going to go to the kernel source and compile that module?

You would want to look into the "modinfo" command to find the actual kernel module name. In this case, that isn't going to work.

The initrd is controlled by the "os-initrd-mgr" script that is specific to Slackware Aarch64. In most cases you will not need to worry about it. It is just a shell script and it is executed when a new generic kernel is installed/upgraded. The os-initrd-mgr can be configured in a number of ways. I found it mostly necessary to manually execute os-initrd-mgr when developing support for new hardware models. The man page has more information about the internals and command line switches.

drmozes · 06-19-2023, 12:09 PM

These modules have been included within the latest batch which is heading out as I write this.

I suspect udev will pick up your USB sound hardware and load the module directly, but if not you'll need to load them once the OS has fully booted.

Sound modules are not included within the Operating System Initial RAM Disk (OS InitRD) because they aren't required to boot the system from cold.
You've found a gap in the documentation so I've added a section 'Loading Additional Linux Kernel Modules within the OS Proper' to all 3 guides explaining how to load modules from within the OS Proper: basically, edit /etc/rc.d/rc.modules

Thanks for the suggestion.

glorsplitz · 06-19-2023, 06:48 PM

slac-in-the-box let us know if get anywhere

slac-in-the-box · 06-27-2023, 08:20 PM

Yay! USB headset functions perfectly! Thanks for the update -- I've been too busy parenting and hadn't rebuilt a kernel yet -- now there's no need. Thank you mralk3, drmozes and glorsplitz! And yes, headphones were detected and the kernel modules loaded automatically!