Working fine here with dump1090, dvb_usb_rtl28xxu should be blacklisted?
Well, that's the point: it should not be necessary to blacklist it. It's supposed to detach when some other program using libsdr is asking to use it. Not only does it not detach, I can't unload it even with force. So something's changed, but looking at the messages it's totally unclear where. I _think_ it might be plasmashell trying to use the device as that was the latest update, but it could be anywhere else.