this post was submitted on 28 Jul 2023
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Monitors won’t sleep on idle pc (lemmy.ml)
submitted 1 year ago by SeckoObsadene@lemmy.ml to c/linux@lemmy.ml
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So I’ve set up pop os, everything went smoothly. But I have a problem - My pc is set to turn screens off after 15 mins, also to lock itself. But when it does that, my monitors shut down for a second, then start again so I can see it’s locked, then after few seconds monitors are blank but not turned off, led indicator is active and so is backlight panel.

It bothers me because I don’t want to physically turn off my monitors every time I go afk.

Can anyone tell me where to set this up? Thx

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[–] NixDev@programming.dev 3 points 1 year ago (1 children)

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

[–] SeckoObsadene@lemmy.ml 1 points 1 year ago (1 children)

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

[–] joshcodes@programming.dev 2 points 1 year ago (2 children)

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.

[–] unwillingsomnambulist@midwest.social 2 points 1 year ago (1 children)

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.

[–] SeckoObsadene@lemmy.ml 2 points 1 year ago

I’ll have to fix it myself then. It’s weird how it works , even on the old thinkpad is the same.

[–] NixDev@programming.dev 1 points 1 year ago

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