Kernel 6.11 has been super buggy for me. About 3 weeks ago Nobara rolled out that kernel if I’m not mistaken. Do you still have a 6.10 grub option to try out? Since the live usb works that could be the issue.
If all your boot entries are 6.11, boot into the oldest and downgrade that
I think the nobara updater works with yum. You should be able to access to the yum update history and find out what audio related packages got installed in the update and downgrade those. Anything with pipewire or alsa in the package name for example