I feel like I'm doing something wrong with the build and install process. Maybe it's been the case for the last couple of days, in which case I'm terribly sorry for the incorrect test results.
The problem is, I don't get any printk() outputs at all. I'd given `echo "7" > /proc/sys/kernel/printk`, and I even added a usb_audio_dbg() line, which didn't get printed either.
Then I saw this:
$ find /lib/modules/ -name 'snd-usb-audio.ko'|xargs ls ... /lib/modules/5.15.13/extra/usb/snd-usb-audio.ko /lib/modules/5.15.13/kernel/sound/usb/snd-usb-audio.ko ...
modprobe is using the kernel/ version while my commands were installing the extra/ version.
Then I used the following, which also installed the extra/ version: sudo make -C /lib/modules/5.15.13/build M=sound modules_install
Are these two versions supposed to exist? What is the solution? Telling the kernel build system to choose the correct location or configuring modprobe or depmod or something? I tried to look it up, but didn't find any official recommendation.
Anyway, I ran this:
# Because I have space constraints # find /lib/modules/5.15.13/ -name '*.ko' -exec strip --strip-unneeded {} + # update-initramfs -u -k 5.15.13
That updated the extra/ version of snd-usb-audio. But even after a reboot, this is what I get:
# modprobe -r -v snd-usb-audio rmmod snd_usb_audio rmmod snd_usbmidi_lib # modprobe -v snd_usb_audio dyndbg==p insmod /lib/modules/5.15.13/kernel/sound/usb/snd-usbmidi-lib.ko insmod /lib/modules/5.15.13/kernel/sound/usb/snd-usb-audio.ko index=-2 index=-2 index=-2 dyndbg==p # dmesg |grep 'implicit:'
Another thing is, even though I'd commented out my clock workaround, I'm not getting any clock-related warning at all (I'm sure those went away after I edited clock.c, and then performed a build+install).