Description of problem: Multiple users of the Lenovo Legion 5 (2020) laptop (15arh05h) have noticed brightness controls being completely broken for the built-in display. The laptop supports hybrid and discrete graphics mode, and in either case, moving the brightness slider with designated keys or in software to not cause the built-in display to dim/brighten. Attempted Fixes: Adding "acpi_osi=linux acpi_backlight=vendor" to the GRUB kernel parameters - Brightness control doesn't change with or without these. Version-Release number of selected component (if applicable): Fedora 37 (Workstation) GNOME 43.2 Wayland windowing system How reproducible: Works 100% of the time for mine and another Legion 5 user's machines. Steps to Reproduce: 1. Run/install Fedora 37 on a Lenovo Legion 5 (2020) laptop 2. Install proprietary NVIDIA drivers and reboot 3. Attempt to use gnome software brightness controls or brightness keys Actual results: Display backlight is locked to maximum brightness. Expected results: Built-in display should change illumination level in accordance with the brightness slider when it is moved. Additional info:
I can confirm this. I also own a Lenovo Legion5 Pro laptop and brightness control doesn't work for me as well.I use the KDE spin, btw. I tried both in X11 and in Wayland, this doesn't make a difference: the notification slider in the center of the screen moves from 0 to 100% when using the mouse-wheel over the battery symbol in the panel, or by using the function keys on the built in keyboard, but brightness does not change. I have just tried KDE Neon in a live version on a USB drive and there it works, also when using openSUSE I have no problems with that. It is just in Fedora that things work differently. Version-Release number of selected component (if applicable): Fedora 38 (KDE spin) KDE Plasma 5.27.6 Kernel 6.3.11-200.fc38.x86_64 Wayland and X11 windowing system How reproducible: Works 100% of the time for my Legion 5 user's machines. Steps to Reproduce: 1. Run/install Fedora 38 on a Lenovo Legion 5 (2023) laptop 2. Install proprietary NVIDIA drivers and reboot 2a Using the AMD GPU gives the same result 3. Attempt to use KDE software brightness controls or brightness keys Actual results: Display backlight is locked to maximum brightness. Expected results: Built-in display should change illumination level in accordance with the brightness slider when it is moved.