I have this same problem on one of my LG 4k monitors that only started recently when I started using it with a new Geekom tiny PC that I bought. When I plug the monitor into the USB4 on the PC to DP on the monitor, it does that same thing. It doesn't do it all the time, and it's really...
Actually, it's just Windows key + B
EDIT: nvm, it's Win+Alt+B... I'd been using the shortcut so long my muscle memory was pressing Alt for me. Sorry for the confusion.
I'd recommend going with a Bluetooth setup vs pulling power from the Deck. You'll drain the battery fast and lose your only USB port.
Look for something with both a DAC and amp, Bluetooth, both 3.5 and 4.4mm jacks, and a simplistic interface. Avoid anything with Android as the interface, or...
Well, knowing how bad some of these initial firmware releases have been, I'd be a bit nervous about buying one that can't be updated. Actually, more than a bit.
I really wish they were 3840x1600, like my good ol 38GN950. Or 5120x2160... even better. I'd upgrade to the 39" if it was. Samsung or LG tech, don't care which. I wasn't a big fan of the overblown 800R curve on the previous 45" either. It's a bit ridiculous. Sad to see they kept it the...