That was indeed worth a lot. Built this sound.git on two machines: make menuconfig enabled: * MIDI 2.0 Support by USB audio driver * Support for UMP Events Save to .config make Found to .ko files in usb folder: snd-usb-audio.ko sndmidi-lib.ko Ubuntu 22.04 LTS (Linux H3 5.19.0-43-generic #44~22.04.1-Ubuntu) with 5.19 HWE Stack Option sudo insmod snd-usb-audio.ko insmod: ERROR: could not insert module snd-usb-audio.ko: Invalid module format Ubuntu 23.04 (runs in KVM) (Linux Ubuntu 6.2.0-20-generic) sudo insmod snd-usb-audio.ko insmod: ERROR: could not insert module snd-usb-audio.ko: Unknown symbol in module [37207.309239] snd_usb_audio: Unknown symbol snd_ump_receive (err -2) [37207.309275] snd_usb_audio: Unknown symbol media_entity_pads_init (err -2) [37207.309289] snd_usb_audio: Unknown symbol media_remove_intf_link (err -2) [37207.309311] snd_usb_audio: Unknown symbol snd_usbmidi_resume (err -2) [37207.309420] snd_usb_audio: Unknown symbol media_device_delete (err -2) [37207.309434] snd_usb_audio: Unknown symbol snd_ump_endpoint_new (err -2) [37207.309440] snd_usb_audio: Unknown symbol media_devnode_create (err -2) [37207.309449] snd_usb_audio: Unknown symbol media_device_unregister_entity (err -2) [37207.309460] snd_usb_audio: Unknown symbol snd_usbmidi_disconnect (err -2) [37207.309468] snd_usb_audio: Unknown symbol media_device_usb_allocate (err -2) Can it be done on 6.2 or 5.15 ? How to insert the new module or build it so it can be used with a current kernel ? How to proceed in case the existing module is use (rmmod) ? Canoncial does not provide kernel sources for newer kernels than 6.2 , like 6.4.0.rc2 of this sound.git, at least could not find them, but I did successfully built the 6.2 and 5.15 Ubuntu distro kernels already from their respective sources. Just copy the sound/usb and sound/core files over the current kernel sources, recompile it (of-course with and updated version number).
