On 2008.11.07 14:23:38 +0800, Wu Fengguang wrote: > Hello, > > We can now enjoy music on HDMI monitors that are attached to Intel G35/G45 > chipsets with the following X.org intel driver patches > > [PATCH 1/3] introduce i830_hdmi_priv.has_hdmi_sink > [PATCH 2/3] enable Intel G45 integrated HDMI audio output > [PATCH 3/3] enable Intel G35 SDVO HDMI audio output > > _and_ the corresponding ALSA patch posted at > http://mailman.alsa-project.org/pipermail/alsa-devel/2008-November/012158.html > > The patches are tested OK on Intel DG45ID board, HP 2230s notebook and > ASUS P5E-VM board. Pushed xf86-video-intel patches. Thanks! If you have HDMI output with intel graphics chips, you can test this now. - alsa patch is within above mail, or get it from git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git - after loading snd_hda_intel, 'aplay -l' should give you a list of devices that contains Intel HDMI device. Use that device for PCM. Current supports G35/G45/GM45. - build xf86-video-intel git master to enable HDMI audio within video driver. > > Since the HDMI audio requires both audio and video driver support to function > well, I'd like to provide an overview here. > > 1) driver components: > A) ALSA: audio driver (the above link) > B) Xorg: audio output enabling (this patchset) > C) Xorg: EDID/ELD information (patches to be submitted by Ma Ling) > > 2) summary of the feature sets: > - basic 2-channel audio: > (A) is required, (B) is mostly required, (C) is not needed > - 2+ multichannel audio: > not tested yet; in theory we need (C) to get HDMI monitor's > speaker allocation configuration; there are also bandwidth > constraints that should be coordinated between audio/video > drivers in the future. > - non-LPCM audio: > not tested yet; need more work in ALSA code. > > 3) summary of the work flow: > - basic audio output: (A) and (B) > - ALSA HDMI driver: enable pin out and unmute > - ALSA HDMI driver: fill audio infoframe and enable its transmission > - Xorg intel driver: enable audio output > - ELD info for advanced audio capabilities: (A) and (C) > - Xorg xserver: get/parse/store EDID extensions > - Xorg xserver: transform EDID into ELD > - Xorg intel driver: feed ELD to hardware > - Xorg intel driver: set ELD-Valid flag to inform audio driver of new ELD > - ALSA HDMI driver: response to unsolicited response triggered by ELDV > - ALSA HDMI driver: get ELD from hardware > - ALSA HDMI driver: parse and show ELD info > - ALSA HDMI driver: update hardware capabilities/constraints > according to ELD (TBD) > > That describes my understandings of HDMI audio, comments and discussions are > warmly welcome. > > Thank you, > Fengguang > -- -- Open Source Technology Center, Intel ltd. $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
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