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What type of monitors do you have?I had the same issues with my BenQ monitors about 2 years ago and never found a solution. I ended up using it as an excuse to upgrade from 1080 to 1440.
Everything worked fine for a few years with the BenQ then after an update it started happening.
Have you tried a different distro? Just boot from a USB image and give it a few min to sleep. Wondering if it is a x11 or Wayland issue with older monitors
Yes I had same issue on Mint on another pc (laptop with built in monitor) so it has to be fixable. I have 2 monitors - Samsung and Asus, I don’t think they are the problem. It has to be driver or some settings I can’t find. I can see mouse cursor and black screen, sometimes it will bring OS back to Lock Screen without me interacting with mouse or keyboard.
It starts to be annoying
I think it's a fun (hahaha not) part of the hdmi protocol. I have the same monitor combo and the same issue with the monitors. I find that turning one off fixes it (usually Samsung since my Asus monitor completely shuts down for power saving) but I also remember at least one of my distros not having this issue. Unfortunately it's not Ubuntu which I'm on at the moment so I can't help but either Fedora, Debian or Manjaro didn't have the issue.
Happens to me with three Dell displays attached to an AMD GPU with DisplayPort. Distro is EndeavourOS. Whenever it happens there happens to be a kernel update available and, after installing it and rebooting, the problem goes away for a few days.
I’ll have to fix it myself then. It’s weird how it works , even on the old thinkpad is the same.
Never thought about HDMI being the issue. My new monitors are display port and have been working fine. So a HDMI bug is probably the cause
Check the monitor's settings menu. I remember having to turn this feature on with my HP.