I'm trying to use Redshift on my Raspberry Pi, but running
redshift -O 2500 gives the error
Gamma ramp size too small: 0 Failed to start adjustment method randr. Trying next method... Using method `vidmode'.
I've seen that I have to enable OpenGL graphics from
raspi-config > Advanced Options > GL Driver, and other posts say there should be an option to enable "Experimental OpenGL Driver".
But on my version (just upgraded to Raspbian Stretch), I have 3 options (not "Experimental"):
- GL (Full KMS)
- GL (Fake KMS)
None of them seems to work (I rebooted and got the same error).
Is there any other package to install ? Or is it even possible with Stretch ?
Note: (don't know if this can be helpful)
minecraft-pi with the Full KMS driver, I got this warning several times:
libEGL warning: DRI2: failed to authenticate