Originally Posted by bram
My TV, Sony XBR-4 has no setting for this.
And there are
people who are able to help out, ankh just solved it for me:
Sound-over-HDMI is disabled if you do
This, however, has nasty side effects, so the best course of action (until nvidia implements a driver option) is to use "CustomEDID".
In short, you need to remove the extended block from the EDID you get from your TV.
OK, but wouldn't you think there should be an
Option "HDMIAudio" "disable"
flag in your xorg.conf file? Or a checkbox in nvidia-settings? We don't know that though. Glad you found a workaround, but I sure hope there are less strenuous means of stopping audio over HDMI for less techno-savy users.