Re-enable ALSA Sequencer Support in Kernels > 5.10.x (CONFIG_SND_SEQUENCER )

[utajum]

In kernel version 5.10.x, ALSA sequencer support is enabled and works correctly—allowing MIDI applications (e.g., FluidSynth) to access /dev/snd/seq. In later kernels, this support is disabled, breaking MIDI functionality. The source confirms it’s enabled in 5.10.x. I can open a PR to address this, but I'm not familiar with the contribution process for this project. Any guidance or acceptance of this request would be appreciated.

ubuntu@armbian:~$ sudo modprobe snd_seq
modprobe: ERROR: ../libkmod/libkmod-module.c:838 kmod_module_insert_module() could not find module by name='snd_seq'
modprobe: ERROR: could not insert 'snd_seq': Unknown symbol in module, or unknown parameter (see dmesg)
modprobe: ERROR: ../libkmod/libkmod-module.c:990 command_do() Error running install command '/sbin/modprobe --ignore-install snd-seq  && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; /sbin/modprobe --quiet --use-blacklist snd-seq-oss ; : ; }' for module snd_seq: retcode 1
modprobe: ERROR: could not insert 'snd_seq': Invalid argument
ubuntu@armbian:~$ lsmod | grep snd_seq^C

[utajum]

For example, in kernel 5.10.x, this module is enabled:

# config-5.10 (line 5178)
CONFIG_SND_SEQUENCER=m

But in kernel 6.6.x, it is disabled:

# config-6.6 (line 5659)
# CONFIG_SND_SEQUENCER is not set

This breaks MIDI (and other ALSA) functionality. See the full configs here:

• config-5.10, line 5178
• config-6.6, line 5659

[ophub]

https://github.com/ophub/amlogic-s9xxx-armbian/tree/main/compile-kernel/tools/config

Here is the config file. You can adjust the options here to achieve the appropriate configuration. Just submit the latest config file.