When using Steam Deck Dock, external monitors do not work upon wake from sleep
If you use a Steam Deck Dock, put the steam deck to sleep, then wake it, the external monitor no longer works. It starts working again when you switch to either Desktop mode or Gaming mode.
i literally just tried it again after a bit and it worked, so maybe waiting works too
ideally it should just work immediately on wake though
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with the psu unplugged it works just fine