Created attachment 130646 [details]
Samples as seen by placing the cursor next to the preview in KDE System Settings.
Most visible when viewing cursors with a white or light outline on a white or light background. Light pixels which are semitransparent will appear darkened, even pixels with no significant gray value will appear much darker than they should.
For testing cursor sets which illustrate this; KDE Breeze and El Capitan show this effect extremely well.
What chip is this? Please attach your xorg log and dmesg output.
Created attachment 131156 [details]
Xorg log and dmesg output
Created attachment 131157 [details]
Correct dmesg output and Xorg log
I have uploaded the data that Alex Deucher requested.
I hope this helps to clarify the problem. If you need more information, please, let me know.