On Tue, Mar 4, 2008 at 4:44 AM, Jiang zhe zhe.jiang@intel.com wrote:
On Mon, 2008-03-03 at 06:59 +0800, Tobin Davis wrote:
It is possible that HDMI audio is pulled from an unknown i2c bus on the video chip. 3dfx did that a long time ago with their 3500 card for their tv tuner portion.
I think at this point, unless Steven knows more, this may be unsupported until nVidia adds support in their driver or opens up part of the spec.
I googled some info about the nvidia G84** or G86** graphics core. They got the audio signal from the external audio device through spdif.
For Dell M1330, the spdif configuration for the stac92** codec looks well, maybe the graphic driver can control whether the audio signal is allowed to transfer through the HDMI port?
In addition to anecdotal evidence, I can confirm that on my work machine the ATI video driver does seem to touch the audio. Interestingly it's the userspace X driver, not the in-kernel FGLRX module.
rlrevell@chronopolis:~$ strings /usr/lib/xorg/modules/drivers/fglrx_drv.so | grep -i hdmi | grep -i audio ex_aHDMIAudioParameters
Isn't DRM fun? ;-)
Lee