I'm running Ubuntu 20.04, and HDMI to my display via a 4K switch. I have another machine connected to the same switch. If I switch the inputs to that box and back, I end up with a black screen in Ubuntu.
The monitor shows the input type for a second or two, then goes to standby, and repeats; I have to manually reboot to recover. I tested using several HDMI cables, even an optic fiber cable, same issue. I tested running HDMI directly, and when I switch inputs on the monitor I have the same issue.
Now, the switching between HDMI inputs works just fine under Windows on both boxes. It also works fine if I run DP to the monitor from Ubuntu; I can switch inputs on the monitor without losing the display when I return to Ubuntu. However, I need to run the systems in another room and send the display via HDMI, hence why I want to solve this issue.
So, I suspect the issue lies with Ubuntu 20.04 and HDMI. I tried using both Nouveau and NVIDIA 460 drivers to no avail. My graphics card is an EVGA RTX 2070 XC Ultra Gaming, and the monitor is a Samsung U32H850 32" 4K UHD Quantum Dot Monitor.
Does anyone know what might be causing the issue?
1 Answer
Same issue here. But my monitor is a Samsung U32J590 32'' 4K UHD and NVIDIA GeForce GTX 950. Everything works fine until you change the source on the monitor.
neofetch OS: Ubuntu Hirsute Hippo (developmen Kernel: 5.11.0-13-generic Uptime: 16 mins Packages: 1908 (dpkg), 10 (snap) Shell: bash 5.1.4 Resolution: 3840x2160 CPU: Intel i7-3770 (8) @ 4.100GHz GPU: NVIDIA GeForce GTX 950 Memory: 2273MiB / 7896MiB
I solved the problem changing the driver of NVIDIA from 460 to 390enter image description here
Now everything is working fine.
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