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
I have the same issue on two different laptops with external monitor. On system start is the laptop screen very bright. But brightness applet shows that laptop screen is set to 25 %. I need to touch the slider to fix it. I'm sure this is some regression as it worked correctly in past. Operating System: Gentoo Linux 2.18 KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.20.0 Qt Version: 6.9.3 Kernel Version: 6.18.0-gentoo (64-bit) Graphics Platform: Wayland Processors: 12 × 12th Gen Intel® Core™ i7-1265U Memory: 32 GiB of RAM (31.0 GiB usable) Graphics Processor: Intel® Iris® Xe Graphics Manufacturer: Dell Inc. Product Name: Latitude 5530