Comment 31 for bug 1377653

My 2 cents worth is this is a common hardware problem where newer Laptops have GPU HDMI sound turned off as a default. I think a grub kernel boot parameter could be set to force `setpci` to be run at appropriate memory location.

Therefore the Linux Kernel team could be responsible for the bug fix. However, the nVidia folks might be responsible for submitting the fix to the Linux Kernel Team.

As a side note, I've stopped using the nVidia card in Linux for the last six months. Since I'm only using the Intel iGPU Skylake GT 530 graphics, I'm happy the nVidia GTX 970M HDMI sound is turned off and not generating heat.