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[Bug 1971434] Re: Display powersave only blanks, but does not turn off

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel van Vugt <1971434@xxxxxxxxxxxxxxxxxx>
Date: Fri, 04 Jul 2025 05:10:00 -0000
Reply-to: Bug 1971434 <1971434@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

** No longer affects: gnome-settings-daemon (Ubuntu)

** Also affects: mutter (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Also affects: mutter (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: mutter (Ubuntu Questing)
   Importance: Medium
       Status: Fix Released

** Also affects: mutter (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: mutter (Ubuntu Plucky)
       Status: New => Fix Released

** Changed in: mutter (Ubuntu Oracular)
       Status: New => Won't Fix

** Changed in: mutter (Ubuntu Noble)
       Status: New => Triaged

** Changed in: mutter (Ubuntu Noble)
   Importance: Undecided => Medium

** Changed in: mutter (Ubuntu Plucky)
   Importance: Undecided => Medium

** Changed in: mutter (Ubuntu Noble)
    Milestone: None => noble-updates

-- 
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https://bugs.launchpad.net/bugs/1971434

Title:
  Display powersave only blanks, but does not turn off

Status in GNOME Settings Daemon:
  New
Status in Mutter:
  New
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Noble:
  Triaged
Status in mutter source package in Oracular:
  Won't Fix
Status in mutter source package in Plucky:
  Fix Released
Status in mutter source package in Questing:
  Fix Released

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 ]

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