modetest |grep connected
185 184 connected HDMI-A-1 1600x900 45 184
194 0 disconnected HDMI-A-2 0x0 0 193
198 0 disconnected DP-1 0x0 0 197
Hashbrown:~ #
So, I poked through modetest, I can see that 185 max bpc is set to 10, however I still get the audio dropouts. Dont know why it says 1600x900, as it is 2160p.