I've always been able to turn the screen off by lowering the screen brightness. The last step would turn the screen off.
But since I recently did a firmware upgrade using fwupdmgr this doesn't work anymore. The screen's brightness simply goes one level lower.
The device which I upgraded:
UEFI-124c207d-5db8-4d95-bd31-34fd971b34f9-dev0 Guid: 124c207d-5db8-4d95-bd31-34fd971b34f9 DisplayName: XPS 15 9550 Provider: UEFI Flags: internal|allow-offline|require-ac Version: 0.1.4.0 VersionLowest: 0.1.4.0 Created: 2017-10-22 Trusted: none
I have a Dell XPS 15 9550 running Loki.
/sys/class/backlight/intel_backlight/brightness contains 1 at the lowest brightness. I can fill it with 0 manually, which does turn the screen off, I just can't do that with my brightness keys.
cat /sys/class/backlight/intel_backlight/max_brightness contains 1500.
Is anyone experiencing the same issue? Is this changeable in configuration maybe?