I get the following errors all in a row in my journalctl after booting:
colord-sane[4901]: io/hpmud/musb.c 2101: Invalid usb_open: Permission denied
colord-sane[4901]: io/hpmud/musb.c 2101: Invalid usb_open: Permission denied
colord-sane[4901]: io/hpmud/musb.c 2101: Invalid usb_open: Permission denied
colord-sane[4901]: io/hpmud/musb.c 2101: Invalid usb_open: Permission denied
colord-sane[4901]: io/hpmud/musb.c 2101: Invalid usb_open: Permission denied
I don't know if it's related to this post, but the permission denied issue looks very similar. I tried going through those steps looking for parallels between saned and colord-sane but wasn't sure what user to add to which file, or what group it needed to be added to.