Until a few days ago I had my monitor connected via HDMI and it was working fine and I had even saved a display profile for it but at some point, the monitor has since stopped detecting the computer. When I replug the HDMI cable, the monitor displays “No HDMI signal from your device.” When I open the Qubes OS Display settings, the monitor does not show up as an option in the dropdown menu either. Both the monitor and HDMI cable have been tested working on Windows 11. How can I get the monitor to be detected by Qubes OS again?
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First of have you tried a different HDMI cable? Personally happens all the time they break.
Can you see that the display is connected when running xrandr in dom0? Can you see your device when running lspci (prob starts with VGA)?
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Hi, I’ve tried two different HDMI cables and they both work fine on Windows but not anymore on Qubes OS. My computer only has one HDMI port (no DisplayPort or anything else).
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Hi 
, when you say work fine in Windows is in the same computer? use xrandr | grep "connected" your monitor is listed?
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All tests were done on the same computer. This is the output of xrandr | grep "connected" in dom0 terminal:
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Am lost because HDMI is not listed, in my case when disconnect my monitor have this
HDMI-1 disconnected primary (normal left inverted right x axis y axis)
in your case don’t seems to detect HDMI ports at all, run lspci | grep 'VGA' to check your video controller
Another thing would be to verify that your system is up to date.
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Hi there i found this and maybe can fix your problem.
Did you update your dom0 during the last successful boot?
Maybe there is some issue with newer kernel, try to boot Qubes OS with older kernel version by selecting the corresponding boot option in GRUB boot menu → Advanced options for Qubes → Xen hypervisor → select kernel version.
Regards
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