Try adding this to /etc/environment:
MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0
and then reboot.
** Summary changed:
- Wayland/Gnome doesn't DPMS screens on idle/screensaver wasting energy and
burning LEDs
+ Backlight does not turn off during screen blanking
** Tags added: amdgpu blank
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2007268
Title:
Backlight does not turn off during screen blanking
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