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HDMI forum rejects AMD's open source 4K@120Hz and 5K@240Hz HDMI driver
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That's interesting, though not my experience. If a monitor is turned off then the PC picks up that it has disconnected.
The scenario I described occurs when the OS (Windows) sleeps the screen after inactivity. It could be a function of the laptop, of the monitor, or of the cables. In my set up using HDMI over display port solves it.