If it's any help, this problem seems to have been introduced in kernel 4.8. I tested different kernels with UKUU. Kernels prior to 4.8 do not have the colour banding issue.
If it's any help, this problem seems to have been introduced in kernel 4.8. I tested different kernels with UKUU. Kernels prior to 4.8 do not have the colour banding issue.