I have the same bug as the OP. And the workaround number one also worked for me. However, I was reading all those comments and I found some little differences, listed below...
- on Ubuntu 24.04.1. - on Wayland, and also tested on X11. I get this bug on both Wayland and X11. Using either Super+L or the power saving settings. I also logged on X11 and tested 'sleep 1; xset dpms force off'. Unlike the author and some other people here, this command didn't work either. The screen goes off and then back on a few seconds later. #47 : BINGO ! "My bet is they send some message back to the computer when they change power state after requested to go to full power save. That in exchange wakes up the system, which then keeps the screen blank, but backlight don't go off (...)" — I think exactly the same. That's the only way I can explain this. Remember the workaround number one, in the OP: "Configure the monitor (in its own menus) to not auto-switch inputs." This is a clue. #50 ♥ "We should solve this issue before Earth Day. It has caused a lot of wastage of electricity." #60 : "MUTTER_DEBUG_FORCE_KMS_MODE=simple" in Ubuntu 24.04. I should try this. This bug affects many people. I saw it on https://www.facebook.com/groups/ubuntudistros. And there are probably many duplicates. And thousands undetected and unreported. @vanvugt Yes, this bug is not a security issue, but I would call it a "hardware durability" issue. When the LED backlight and the LCD stays on, it wears out faster. Over time, the color loses its accuracy. And then, eventually, the equipment breaks down and ends up in the trash. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/1971434 Title: Display powersave only blanks, but does not turn off Status in Mutter: New Status in gnome-settings-daemon package in Ubuntu: Triaged Status in mutter package in Ubuntu: Triaged Bug description: [ Impact ] On some machines when the screen blanks, the LCD backlight stays on. [ Workarounds (reported to work by some people) ] * Configure the monitor (in its own menus) to not auto-switch inputs. * Change from HDMI to DisplayPort cables. * Disable HDMI audio output. [ Test Plan ] 0. Make sure you're using an LCD (not OLED) so you can see if the backlight is on. 1. In Settings -> Power -> Screen Blank, set the inactivity period to 1 minute. 2. Verify after 1 minute that the screen is blank and the backlight is also visibly off. [ Where problems could occur ] [ Other Info ] To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1971434/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
