Changing keyboard brightness somehow affects the display brightness

[Evan-aja]

Model: sudo dmidecode | grep "Product Name" -B 2 -A 4

System Information
	Manufacturer: Acer
	Product Name: Nitro AN515-57
	Version: V1.19
	Wake-up Type: Power Switch

Base Board Information
	Manufacturer: TGL
	Product Name: Scala_TLS
	Version: V1.19
	Asset Tag: Type2 - Board Asset Tag

Count of keyboard RGB zones: 4

Count of Cpu Fans: 1

Count of Gpu Fans: 1

RGB keyboard works? Yes

Turbo button turn on fans? No

Turbo button turn on LED? No

Turbo button activates overclock? No

I have found a behavior on my Nitro 5 where whenever I increase the keyboard's brightness, it also calls the display's decrease brightness button.

When I adjust the display brightness to normal, the display's decrease brightness button cease to function. this was tested on Gnome and KDE, X11 and Wayland on vanilla ArchLinux. this issue persist until the next boot of the system, until the button is pressed again that is.

nothing appeared on terminal nor systemd log. this issue has long existed even before my merge request on #74.

[Kapitoha]

Hi. I have the same behavior on my PH317-53. But I thought it was because I replaced my keyboard :smile:

[snowyoneill]

Adding reference to previously discovered bug https://github.com/JafarAkhondali/acer-predator-turbo-and-rgb-keyboard-linux-module/issues/24

[Evan-aja]

A workaround that I found is before changing keyboard brightness

1. switch to an unused TTY session with ctrl+alt+f{1-12}
2. change the keyboard brightness arbitrarily
3. return to desktop's TTY session (can be f1, f2, or f7, try whichever works)
4. now it is possible to change the keyboard brightness without affecting the screen's brightness, at least until the bug is fixed
5. do this on every reboot

[Evan-aja]

On KDE Plasma 5.27 with kernel 6.2.10, although the screen brightness changed, the brightness down function still works.