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Hi, this thread is a bit old now, but have you got the usb audio working?
Generally, I blacklist the hdmi audio module, and then I'm able to begin to get the other audio modules (kernel) sorted.
Blacklist the hdmi audio..
# blacklisted modules for PCI coldplug
# see also /etc/modprobe.d/blacklist-compat
# For some bridges both intel-agp and i82875p_edac are loaded. If i82875p_edac
# is loaded first it will grab the device. Then intel-agp doesn't work.
# Therefore we disable automatic loading of 82875p_edac. (Bug 213840)
# do not use "Boot Protocol" drivers, we prefer usbhid
# and they cause problems when loaded together with usbhid (#37726, #40861)
# disable PC speaker by default
# pcspkr is the standard driver, while snd-pcsp is the ALSA driver
blacklist snd_usb_audio # no longer being used on this system
blacklist snd_hda_codec_hdmi #hdmi nvidia digital stereo
#blacklist snd_hda_codec_realtek #hda onboard 5.1 surround
# Prevent conflicts with nvidiabl
# End of entries added for nvidiabl
add the line in red and save the file and reboot.
You need to be root to save this change!
If the hdmi kernel module is still there, reboot again. Because...
The module loading system of the kernel looks to see what is being used and tries to use those modules on the next boot. So
Usually you need to reboot twice for the new info to take action.
you could try to unload it with...modprobe (as root)
modprobe -r snd_hda_codec_hdmi
Sometimes this is difficult because of dependants.
Once you get that module out of use, you should be able to use the method you used before, in fact it's probably working.