I have a laptop and external 4K screen. Laptop is setup as having 30% screen brightness in 'power management > display and brightness' This setting was working ok (reproducible brightness) but is now lost after sleep/standby. The systray-brightness slider still says 30%, but the screen is noticeable brighter. Just touching the slider 'fixes' the effective brightness immediately (so i set it back to point to exactly 30% again) I did not yet check the output of 'brightnessctl info' directly after resume (will do...) One more thing: in power management > display and brightness' i can only preset the brightness for the laptop screen, not for the secondary monitor - although in systray we have two brightness sliders. Is this intentional?
Operating System: Fedora Linux 42 KDE Plasma Version: 6.5.80 KDE Frameworks Version: 6.20.0 Qt Version: 6.9.2 Kernel Version: 6.16.10-200.fc42.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics Memory: 64 GiB of RAM (58,5 GiB usable) Graphics Processor: AMD Radeon 780M Graphics Manufacturer: LENOVO Product Name: 21K5000JGE System Version: ThinkPad P14s Gen 4
it happens after sleeping and turning off/on the screens laptop-screen is to bright: brightnessctl -d 'amdgpu_bl1' get 119701 set same 30% again, screen is darkening to the expected 'brightness': brightnessctl -d 'amdgpu_bl1' set 30% Updated device 'amdgpu_bl1': Device 'amdgpu_bl1' of class 'backlight': Current brightness: 119700 (30%) Max brightness: 399000 No change in output-values... brightnessctl -d 'amdgpu_bl1' get 119701
Can you please run `kscreen-doctor -o | grep -i bright` before putting the system to sleep, and then again afterwards? This seems potentially related to bug 503268
before sleeping (laptop and 4k screen are both at 30%) kscreen-doctor -o | grep -i bright Brightness control: supported, set to 30% and dimming to 100% Brightness control: supported, set to 30% and dimming to 100% after sleeping: kscreen-doctor -o | grep -i bright Brightness control: supported, set to 30% and dimming to 100% Brightness control: supported, set to 30% and dimming to 100% brightnessctl -d amdgpu_bl1 set 30% Updated device 'amdgpu_bl1': Device 'amdgpu_bl1' of class 'backlight': Current brightness: 119700 (30%) Max brightness: 399000 kscreen-doctor -o | grep -i bright Brightness control: supported, set to 30% and dimming to 100% Brightness control: supported, set to 30% and dimming to 100% Btw, sleeping is not really necessary: Lock screen, then press ESC to switch off both screens, wait a bit, re-login is sufficient for the increased brightness on the laptop screen
Thanks! I'll let the Plasma developers take it from here