On Tue, Nov 12, 2013 at 10:15:03PM -0600, Stan Hoeppner wrote: > On 11/12/2013 7:11 PM, Doug wrote: > > On 11/12/2013 07:32 PM, Stan Hoeppner wrote: > >> On 11/12/2013 5:37 PM, Jon N wrote: > >> ... > >>> There is one an area that I'm pretty unsure of. I am planning on > >>> purchasing a Nvidia video card and disabling the built in Intel video > >>> support. Since I plan to use this computer as a MythTV > >>> frontend/backend (as well as for general web browsing/email) getting > >>> the audio out on the Nvidia card's HDMI port is important to my > >>> particular setup. So will the audio automatically be switched to the > >>> Nvidia cards HDMI connector? > >> No, it won't be automatic. And frankly I don't believe nVidia supports > >> HDMI digital audio pass through, nor any discrete GPU card. For > >> argument's sake, let's say it does. Then you run into the problem that > >> the onboard audio chip can't pass digital audio through PCIe to the > >> nVidia HDMI port. None of them are designed to do this, that I'm > >> aware of. > >> > >> If I were you I'd get a mainboard with with HDMI out and use the CPU's > >> GPU. Mobos that have onboard HDMI have their audio chips wired to the > >> HDMI port, the chips support PCM/AC3 digital output, and selecting the > >> HDMI output for digital audio is pretty straightforward. > >> > >> The Intel GPU should be plenty powerful enough for HD1080 output. If > >> you decide it's not, and want to add a discrete card, you'll need a mobo > >> with coaxial digital SPDIF output, or Toslink optical digital output, > >> and a TV or A/V receiver that is cable of using an HDMI input for video > >> while using coax or Toslink for audio. Nearly all modern A/V receivers > >> support this. WRT LCD/Plasma TVs I have no idea how many support this. > >> > > I have an NVidia GeForce GTX 550 Ti card in a machine with on-board > > Realtek 662 sound > > decoder. Normally--that is locally--sound is decoded by the Realtek on > > the mobo. > > The NVidia card has a mini HDMI connector (I needed an adapter to > > standard) > > and the card has a sound decoder in it. > > This isn't the case. All digital audio (AC3, PCM, DTS, etc) is decoded > at the endpoint device. In this case that is the TV or A/V receiver. > Everywhere else in the path the digital audio stream is simply passed > through. > > The trick with Linux is getting all of the devices recognized, and being > able to select which 'path' the digital stream should take. > > > Using Windows XP, I could run a > > movie thru HDMI > > to my TV set and picture and sound would come thru perfectly. NVidia > > provides a driver > > for Windows that makes this "just work." > > And this is the key. nVidia registers an audio output device that can > be selected in control panel as the preferred output device. WSS then > directs digital audio through this device. There is no such equivalent > in Linux, that I'm aware of. >
ftp://download.nvidia.com/XFree86/gpu-hdmi-audio-document/gpu-hdmi-audio.html There you go; now you can be aware of it. 3.1 Pre-Azalia: Some older GPUs included a connector to receive S/PDIF audio from a separate sound card, and route that audio over HDMI. This document does not cover such devices at all. 3.2. Azalia: Newer GPUs include a fully-fledged sound card, implemented according to the Intel HD-audio ("Azalia”) specification. This document covers such devices. -dsr- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20131113152211.gb4...@randomstring.org
