[Patrics83]

Mmh, I'm extremely surprised that this issue haven't been reported before.
After testing many many builds I decided to make a drastic build switch and OE 4.2.1 has no display dimming issues :/
I can't remember when I started to use sync to display option and since only my kids are watching DVDs I haven't noticed the issue myself until yesterday. My movies are mkv only.

Can anyone suggests a build to try? My testing motivation is fading away

Well, the oldest build from this thread (#1215) and the oldest build from the last thread (#0415b) would be a couple of points in the sand.

Thanks, I gave #1215 a try but my wifi dongle doesn't work with this build. The bad thing is that I need to remove the TV from the wall to reach the rpi so I can connect a cable

I will continue the testing tomorrow.