search

crazii / SBEMU

legacy sound blaster emulation for DOS
GNU General Public License v2.0
607 stars 33 forks source link

HDMI audio output selection on Zotac Ion motherboard #18

Open hooby3dfx opened 1 year ago

hooby3dfx commented 1 year ago

With this motherboard, the SBEMU audio is only coming out of headphone jack and not the HDMI connection. Detection with /SCL says:

1: Intel HDA: NVidia MCP79 (10DE0AC0) -> Realtek (10EC0662) (max 96kHz/24bit/8ch)

I also tried setting the output to both 0 and 1. Any way to set it to the HDMI output?

hooby3dfx commented 1 year ago

Seeing similar issue on HP Compaq Elite 8300 ultra slim desktop.

jclecak commented 1 year ago

I am seeing a similar problem on an Intel NUC, which has no means of audio output other than HDMI. Sbemu appears to be working, but I hear no sound. I also tried setting the output to both 0 and 1. Sound over HDMI works on the system when I'm running Windows, btw. Any suggestions would be greatly appreciated, please and thank you!

wbcbz7 commented 1 year ago

From my HD Audio low-level programming experience, making audio over HDMI work requires GPU-specific initialization, which is usually done in tandem with GPU drivers. Since legacy VGA BIOS on most GPUs usually treats HDMI outputs as simple video-only link (like DVI), it usually ignores any audio stuff, and thus audio over HDMI will not work with generic HDA support code.

Torinde commented 9 months ago

Do Linux, FreeBSD or Illumos support HDMI/Displayport audio? There should be basically three implementations (Intel, AMD, Nvidia) - I doubt the audio part changes a lot between GPU models otherwise.

Torinde commented 9 months ago

It seems HDMI/Displayport audio (AMD High Definition Audio Device) is based on HDA and is located at the PCIe bus and is not so different from regular HDA (Realtek(R) Audio): image

Of course probably it uses different IDs, etc.?