media-plugins/alsa-plugins UnderscoreInUseFlag: USE flag 'arcam_av' uses reserved underscore character UnderscoreInUseFlag: USE flag 'usb_stream' uses reserved underscore character
'usb_stream' is only needed for an old Tascam US-122L audio interface (CONFIG_SND_USB_US122L). So maybe rename is to 'alsa_cards_usb-us122l' and disable by default?