My Rx580 wont allow me to select 10bit in windows ...

Hello Folks, I have a Samsung 65" UA65MU9000

Currently my Resolution is 3840x2160 running at 60HZ

Radeon Software Version - 19.7.5Radeon Software Edition - Adrenalin 2019Graphics Chipset - Radeon RX 580 SeriesMemory Size - 8192 MBMemory Type - GDDR5Core Clock - 1340 MHzWindows Version - Windows 10 (64 bit)System Memory - 16 GBCPU Type - Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz

A  couple of problems. My videocard is running on a premium HD cable capable on doing 60hz, 4k, 10bit (Confirmed with my mate and his setup). But my Radeon settings wont exceed 8bit in ANY Pixel format. Furthermore I dont think HDR is working properly because windows 10 is darker with a grey mouse. My mate plugged in his rx580 and his pc into my cable and my TV and its doing 10bit for him. 

Here is my specs

Horizontal Timing Total - 4400Horizontal Timing Display - 3840Horizontal Timing Front Porch - 176Horizontal Timing Sync Width - 88Vertical Timing Total - 2250Vertical Timing Display - 2160Vertical Timing Front Porch - 8Vertical Timing Sync Width - 10Horizontal Timing Polarity - PositiveVertical Timing Polarity - PositiveInterlaced/Progressive - ProgressiveG.Pixel Clock (KHz) - 594000G.Refresh Rate (Hz) - 60HDMI Link Status Monitoring - DisabledCurrent Link Settings - Not Available

Any help is appreciated.