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Ubuntu 22.04 fresh install. Everything initially appeared to be working OK. I was able to use remote desktop using TightVNC but then I noticed VNC wouldn't reconnect if the screen blanked. Worse, if I disconnected the monitor for any length of time and then reconnected it, there is no display on the monitor. I can still log in via SSH but I would like to be able to use VNC without having a monitor permanently connected.

Rob190
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  • Are you sure it's the screen blanker, rather than the whole system going to sleep? – user10489 Aug 25 '22 at 23:43
  • With the monitor connected I VNC connects. I noticed after a while, the VNC connection dropped and as far as I can tell, it coincides with the screen blanking. I can still SSH ok. Moving the mouse (on the server) turns the display back on and then VNC will connect again. After disconnecting the display, I can still SSH and everything else (web,ftp etc.) is still there so the system has definitely not gone into sleep mode. – Rob190 Aug 26 '22 at 08:21

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Seems this is an old issue e.g.:

How to use Ubuntu 18.04 on VNC without display attached?

Input/output device issues in Ubuntu 20.04

There are partial workarounds involving the creation of a dummy monitor but if you want to swap between using a physical monitor and VNC, you will likely run into the problem where the monitor just displays a blank screen with a cursor top left.

The only reliable solution appears to be to use a dummy HDMI e.g. https://thepihut.com/products/hdmi-dummy-plug.

A hardware workaround for a software bug. Got to be a first.

Rob190
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