Since Xorg is using the modeset driver here I think this might be an issue with the Raspberry Pi kernel driver(s)
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) ** Summary changed: - DPMS does not switch off the monitor back light + DPMS does not switch off the monitor back light on Raspberry Pi 4 ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1852752 Title: DPMS does not switch off the monitor back light on Raspberry Pi 4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852752/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs