https://bugzilla.kernel.org/show_bug.cgi?id=215417
Bug ID: 215417
Summary: setting brightness to 0 permanently turns off screen
Product: ACPI
Version: 2.5
Kernel Version: 5.15.7
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: acpi_power-vi...@kernel-bugs.osdl.org
Reporter: mark.b...@gmail.com
Regression: No
Created attachment 300159
--> https://bugzilla.kernel.org/attachment.cgi?id=300159&action=edit
screen on max
When setting the brightness to 0, either on kde with the brightness controls or
with `brightnessctl s 0` the screen turns off. Then when trying to turn it back
on with the brightness controls, it says off.
The OS didn't get the OFF signal somehow. All the values in
/sys/class/backlight/intel_backlight seem to indicate this.
I attached the output of `grep -r . /sys/class/backlight/intel_backlight/` for
the three scenarios:
1. Screen max on
2. Screen brightness 0
3. Screen should be on, but still off.
inxi output:
CPU: 8-core 11th Gen Intel Core i9-11900H (-MT MCP-)
speed/min/max: 836/800/4900:4800 MHz Kernel: 5.15.7-1-MANJARO x86_64 Up: 12m
Mem: 3232.2/31829.3 MiB (10.2%) Storage: 953.87 GiB (1.0% used) Procs: 328
Shell: Bash inxi: 3.3.11
Laptop model: Dell XPS 9510 (2021) with OLED screen.
I suspect it is related to OLED. The bug doesn't present itself too much in
GNOME as this DE doesn't lower brightness to 0.
Screens can be turned on again by playing with dpms off. Issue presents itself
in both wayland as X.
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