On a new desktop computer with Ubuntu 20.04.3 Night Light does not function. Nor on manual schedule, nor on sunset to sunrise. On my previous PC it worked flawless.
I installed Redshift in the mean time, but it also does not do anything.
Graphics: llvmpipe (LLVM 12.0.0, 256 bits)
GNOME version: 3.36.8
Processor: 12th Gen Intel, Core i7