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Can't enable 10-bit color on HDMI 2.0a compliant Sony X850c 4k TV using an RX 480 and an HDMI 2.0 cable?

Question asked by sythrix on Aug 31, 2016
Latest reply on Aug 31, 2016 by sythrix

I have an X850c 4k TV with Enhanced format HDMI signals enabled. It is supposed to be HDMI 2.0a compliant, and accept 10-bit signals. I have an RX 480 card which supposedly has an HDMI 2.0b output, and should be capable of outputting this signal over HDMI. I have connected the two with a high-speed HDMI 2.0 compliant cable, but the only option in the Radeon settings is for 8-bit color, even though I know all my hardware is compatible with 10-bit.