This bug is supposed to be fixed in the kernel driver: https://bugzilla.kernel.org/show_bug.cgi?id=215203
Then it's been reported this workaround help people who don't have other option (like me) than HDMI and their monitor doesn't have menu option to disable automatic switching between ports: https://gitlab.freedesktop.org/drm/amd/-/issues/1840 I can't confirm yet if that workaround works for me. ** Bug watch added: Linux Kernel Bug Tracker #215203 https://bugzilla.kernel.org/show_bug.cgi?id=215203 ** Bug watch added: gitlab.freedesktop.org/drm/amd/-/issues #1840 https://gitlab.freedesktop.org/drm/amd/-/issues/1840 -- 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 : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
