Hello,
I just noticed that I couldn't set the display to 60Hz.
- LibreELEC 8.90.005: 60Hz not available in 2160p but ok in 1080p
- LibreELEC build #0927: same as above
About my hardware :
- MB : ASRock FM2A88M Extreme4+
- CPU : AMD A6-6400K (3.9 GHz) Black Edition
- GPU : AREZ Radeon RX550 (2GB)
- TV : TV Panasonic TX-55CX700E UHD
- HDMI : KabelDirekt HDMI 4K (2.0)
Just for information, an Odroid C2 works correctly in 60Hz.