Hello,
I'm new here and I'm glad someone has the same problem
TV: OLED77G19LA
Raspberry pi4b 4gb
After switching from Libreelec 10.0.1 to 10.0.2 all 4K movies (ISOs) are extremely dark.. I suspect it is related to "RPi4 support for 10/12bit video output".. I don't have a device between the Pi and the TV! Just an hdmi 2.1 cable. With various settings on the TV I can reduce the effect a bit, but it's no comparison to before. I also tried Libreelec 11.. same problem.. If there are any tips or I can test something for you.. gladly
I'm back to 10.0.1 now.
lg