Comment # 6
on bug 101900
from Alex Deucher
Here's the relevant ALSA code: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/pci/hda/hda_eld.c https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/pci/hda/patch_hdmi.c The display driver parses the audio capabilities of the monitor and then passes that information to the audio driver via a shared structure called the ELD. AMD hardware doeswn't use an ELD directly since display audio support on AMD hardware pre-dated ELD. Instead, the display driver writes fills in the audio descriptors from the monitor into registers that are shared between the audio hardware and the display hardware. The audio driver then parses these registers and generated and ELD which is used by the audio driver to determine what audio modes are supported by the display. See snd_hdmi_get_eld_ati(). See patch_atihdmi() for how the streams are set up on the audio side.
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