I encountered this issue also. But I see what is happening. There are two settings screens that allow modification of this behavior and I would say that is an inconsistency that could be fixed.
Screen Lock (Settings-> Privacy & Security) seems to control both blank screen delay AND also automatic screen lock. blank screen leaves on the display backlights. Lock screen turns off the display backlights. But Settings-> Power also tries to get involved and offers a Screen Blank setting. This Screen Blank setting does not turn off the display backlights. equipment: 12th gen N100 intel mini pc and I'm running 24.04 LTS. an older HP 1920x1084 monitor and an older Del 1920x1200 are connected by HDMI. What I found is that if I ask for Screen Blank in the settings, but not screen lock, both screens blank, but the backlight on the displays stays on. If I then go to Settings->Privacy & Security and ask that automatic screen lock kicks in then the backlights are turned off. ** Attachment added: "one screen shot" https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1971434/+attachment/5833495/+files/Screenshot%20from%202024-10-31%2010-58-02.png -- 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
