snd-aloop module works with modprobe but not if included in /etc/modules

G.L

6/12/23, 10:31 AM

I'm currently using Ubuntu 21.10 64 bit in a VM on QEMU/KVM on RHEL 8.4, system detail at end of post.

I'm work with the ROC audio streamer, which works as expected when I use modprobe snd-aloop from the command prompt to create the ALSA loopback driver.

However, when I include snd-aloop in the /etc/modules instead, I get the following error when calling the aloop from aplay,

aplay -fcd -Dhw:1,1,0 ~/Music/file_example_WAV_10MG.wav 
aplay: main:852: audio open error: No such file or directory

The module appears in the lsmod list when loaded as part of the boot just as it does when loaded using modprobe.

Any advice appreciated.

Linux VM7 5.13.0-28-generic #31-Ubuntu SMP Thu Jan 13 17:41:06 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
root@VM7:/etc/modprobe.d# cat /etc/os-release
PRETTY_NAME="Ubuntu 21.10"
NAME="Ubuntu"
VERSION_ID="21.10"
VERSION="21.10 (Impish Indri)"
VERSION_CODENAME=impish
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=impish

dpkg -l | grep linux-image
ii  linux-image-5.13.0-19-generic              5.13.0-19.19                               amd64        Signed kernel image generic
ii  linux-image-5.13.0-28-generic              5.13.0-28.31                               amd64        Signed kernel image generic
ii  linux-image-generic-hwe-20.04              5.13.0.28.38                               amd64        Generic Linux kernel image

0 + 0

modprobe

drivers

20.10

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: snd-aloop module works with modprobe but not if included in /etc/modules

TH: โมดูล snd-aloop ทำงานร่วมกับ modprobe แต่จะไม่รวมอยู่ใน /etc/modules

RO: Modulul snd-aloop funcționează cu modprobe, dar nu dacă este inclus în /etc/modules

RU: Модуль snd-aloop работает с modprobe, но не в том случае, если он включен в /etc/modules.

VI: mô-đun snd-aloop hoạt động với modprobe nhưng không hoạt động nếu được bao gồm trong /etc/modules

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