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When my machine boots into ubuntu I get "no signal" in my monitor until I press Control-Alt-F1. This makes the login screen appear and everything is normal. But why do I have to press it?

Some notes

  • Control-Alt-F2 doesn't work. My googling tells me that these commands normally change to a virtual terminal, but that doesn't appear to be the case on my system.
  • My monitor is this one which is sold as a smart TV rather than a monitor.
  • My version is Ubuntu 22.04.2 LTS
  • My graphics card (in case that helps) is 8GB NVIDIA GEFORCE RTX 3050 - HDMI, DP, LHR
  • On boot, the monitor wakes up to show me the bios and let me select which operating system it wants. Then it loses signal again until I press the key combination.
  • On very random occasions the screen does work normally, I'm trying to isolate when those are...
  • Booting into windows has no problems at all.

EDIT -

some extra notes:

  • For the last few weeks the drivers for my graphics card haven't been working and it was defaulting to llcm - during that time there were no problems with display when booting, but I also couldn't wake the machine from sleep at all. Now that I've fixed the graphics card, this problem has come back.
Joe
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  • This may be due to several things (and I always find it difficult when this happens to me). Possibilities I encountered: graphics driver did not load, the HDMI port did not signal the connection of the monitor after the monitor being in standby, wrong refresh rate configured. – Sascha Jun 21 '23 at 10:04
  • @Sascha - those are all interesting - I'm keen to work out tests I could run that would confirm or eliminate one of the options? – Joe Jun 22 '23 at 05:12
  • How did you find the key combination? – Organic Marble Jun 22 '23 at 12:13
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    @OrganicMarble I wish I could tell you. I was scrabbling around various blogs and forums from like three different machines... – Joe Jun 22 '23 at 13:32
  • Unhelpfully this has change recently. Now it works fine for startup but not restoring from sleep? – Joe Aug 20 '23 at 08:29
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    @OrganicMarble Ctrl+Alt+F1 is the default key combination to return to gnome login screen after using any of the virtual consoles (Ctrl+Alt+F3...F7). The Ctrl+Alt+F2 takes you to the running GUI session if there is one. – user68186 Aug 28 '23 at 14:36

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