Score:0

Why is there no display until I press Control-Alt-F1?

in flag
Joe

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.
Sascha avatar
cn flag
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.
Joe avatar
in flag
Joe
@Sascha - those are all interesting - I'm keen to work out tests I could run that would confirm or eliminate one of the options?
Organic Marble avatar
us flag
How did you find the key combination?
Joe avatar
in flag
Joe
@OrganicMarble I wish I could tell you. I was scrabbling around various blogs and forums from like three different machines...
Joe avatar
in flag
Joe
Unhelpfully this has change recently. Now it works fine for startup but not restoring from sleep?
ar flag
@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.
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