Could it be uhd@60 consumes all the bandwidth and there is no place left for the sound transmission? Otherwise, this works great (mbp mid-2015 iris, adapter 7.23, sammy uhd tv).
No sound at uhd@60, works @50
Hi Vojislav, sounds should also work ...
please check if there is a driver update aivailable for the Graphics Card, often there is also UHD sound driver in those Driver packs.
Some feedback ...
Make sure your MacBook is post mid 2010, the earlier MacBook models do not support audio output through its mini DisplayPort.
System Preferences > Sound. There are 3 tabs in the window; Sound Effects, Output and Input. Be sure you are on the Sound Effects tab. Middle of the window select your TV where it says "Play sound effects through:".
Select the middle tab named Output.
Select your TV from the drop-down list next to HDMI, below where it says "Select a device for sound output".
Using either Finder or Launchpad go to Applications > Utilities > Audio MIDI Setup.
On the left-hand side of the window you should now see HDMI. In the middle of the window, on the Output tab, where it says "Source:" select your TV from the drop-down list.
If you CANNOT see a speaker icon next to HDMI in the list on the left, do the following:
Bottom left of the window select the wheel icon with the down-pointing triangle. Make sure that sound output is selected and that you can now see a speaker icon next to HDMI in the list of devices.
If you still cannot hear sound, Turn everything off , power tv first and then Mac.
Thanks to notes Alan left I was encouraged to not give up, took another dive, and now I have both uhd@60 chroma 4:4:4 and sound! The trick was not to make a CVT-RB v2 but simply CVT-RB custom resolution in SwitchResX, hope it helps anyone who stumbles upon this.