[gandharva]

To set up my Ambilight sytem I used this HowTo.

What HowTo? Are you explicitly loading or blacklisting any modules?

Maybe @gandharva could share his configuration as it appears to be working for him.

I think he is right. I still have "device_tree=" in my config.txt, as this was the first thing popcornmix told me to check, but I didn't remove it afterwards... This didn't fix the problem with builds #1205 to #1210.
Build #1211 then fixed my issue, but obviously only if "device_tree=" is present in config.txt. So it seems there have been two bugs and the one that is related to device tree support is still present in current builds.

I'm going to remove "device_tree=" from config.txt after work to confirm the report from tija.