This answer record contains patch updates for the HDMI TX Subsystem v1.0.
This patch addresses:
(Xilinx Answer 66290) - Why do I see problems with the Audio mapping in both 2 channel and 8 channel modes?
This patch will be included in the Vivado 2016.1 release. Users needing this patch are advised to update to Vivado 2016.1 or later.
Install the patch per the instructions in the included README.txt file to resolve this issue.
See also (Xilinx Answer 66534) for HDMI TX Subsystem Software Driver v1.0 - Patch Updates for the HDMI TX Subsystem Software Driver