I’ve got the same issue on my laptop except when I go from the performance profile (display looks as I’d expect) to the power save profile my display brightens significantly which seems opposite to what I’d expect it to do. The contrast also increases and the colors look all blown out.
I’ve got the ThinkPad T14 Gen 4 AMD w/ the OLED display so I’m guessing it’s not playing nicely with the OLED display. Adding amdgpu.abmlevel=0 to the kernel parameters ‘fixes’ it by turning the feature off, but I think what’s happening isn’t the intended behavior in the first place.
System information:
Operating System: EndeavourOS
KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.9.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics
Memory: 30.0 GiB of RAM
Graphics Processor: AMD Radeon 780M
Manufacturer: LENOVO
Product Name: 21K3CTO1WW
System Version: ThinkPad T14 Gen 4