Score:0

Ubuntu not detecting my HDMI monitor

cn flag

My computer has ubuntu 21.04, it is not detecting my HDMI monitor. I've already tried the following solutions:

  1. sudo dpkg-reconfigure gdm && sudo systemctl start gdm3

  2. sudo apt-get purge 'nvidia*' &&sudo add-apt-repository ppa:graphics-drivers && sudo apt-get update

  3. sudo ubuntu-drivers autoinstall

  4. sudo apt install gnome && sudo service gdm3 restart && sudo reboot

But they didn't solve the problem!

Score:0
cn flag

I tried other solutions that I don't remember. But, I managed to get the computer to detect the second monitor with the following steps:

  1. I disconnect the HDMI cable
  2. restart my computer
  3. After booting, I connected the HDMI cable. After that the computer recognized the second screen.

I don't know if something else I did generated the fix. But only after these steps did my computer detect the second screen.

Score:0
de flag

I recently had this same problem, and and fixed it by first enabling, and then re-disabling secure boot in the UEFI settings.

Score:0
us flag

I installed 21.04 on my pi4b ok, but after I did 3 things, update, upgrade, and installed OpenSSH, the display moved to the second HDMI port. So, shortly after boot, the display goes away (NO SIGNAL). I left the cable on the second port and called it good.

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