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Last night I unplugged my wireless USB headset receiver from my computer, and one of my monitors disconnected and will not reconnect. So far I've done some troubleshooting including:

  • Restarting my computer.
  • Using a different port on my graphics card. They are all confirmed working with two different monitors.
  • Using a different input on the monitor.
  • Switching out all cables/adapters. Again confirmed working with the same two different monitors.
  • Testing the monitor with a different computer. It is confirmed working.
  • On Windows 10, going to the device manager in the control panel and uninstalling/reinstalling my graphics card.
  • Power cycling the monitor.
  • Updating drivers.
  • Switching to Linux Mint 19.3. Still no picture.
  • Using a fourth monitor. My computer did not detect this one.

After doing all of the above my computer will not detect the monitor and I am at a loss of what to do next. For reference I am using an Nvidia GTX 1660 Ti with driver 26.21.14.4587, and the port I was using for the receiver was on an internal PCIE add-in card. My graphics card has 3 display port ports and one HDMI and I was using a generic HDMI to display port adapter for the monitor.

Thanks in advance for any help or ideas.

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2 Answers 2

Reset to default
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If all of the hardware links have been tested independently, and you can't find/enable it in the display manager's Display settings, maybe X has done something funky to the config relationship. Does it show the monitor connected with a mode set when you run xrandr?

You could try 

xrandr --output [port_name] --auto --brightness 1

Which should turn it on if it's just been --offed somehow, and make sure brightness is up. If it shows up, lists modes, but doesn't have one starred, you might have to do xrandr --output [port] --mode [resolution]

or xset -dpms to turn off any power management stuff that could be strange on this hardware

Also check your /etc/X11/xorg.conf, /etc/X11/xorg.conf.d/, and /usr/share/X11/xorg.conf.d/ for anything strange.

I think I also once had a problem where I've had to re-add the xrandr mode entirely to make a monitor work, there's a guide to doing that here if you want to try it, but usually adding a mode to a port listing none is usually only used for making virtual screens.

But to be honest none of that shouldn't be fixed by switching distro, unless it's being caused by a config file or partition you're keeping between them

Have you tried running a graphical session as the root user, seeing if that makes a difference?

good luck!

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  • For reference I primarily use Windows 10 and have used Linux for about a month, but I'm working through that guide you linked to try and get the monitor detected in Linux. I got to the "addmode" step and got a BadMatch error, and I'm still working to resolve that.
    – jerrythesphere
    Commented Apr 25, 2020 at 14:51
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The problem was a bad HDMI cable. I should have been more thorough in my basic troubleshooting.

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