From owner-freebsd-current@FreeBSD.ORG  Fri Jul 12 20:54:48 2013
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Date: Fri, 12 Jul 2013 22:54:46 +0200
From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@FreeBSD.org>
To: current@FreeBSD.org, mav@FreeBSD.org
Subject: Sound lag over HDMI
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Hey,

I'm trying to setup XBMC on a -CURRENT box with an IvyBridge CPU and
GPU. While testing playback via mplayer on a LG TV over HDMI, I noticed
that sound is lagging video by about 100-200ms or so. When I switch to
using the jack outputs powered by some Realtek chip, audio is perfectly
fine.

Is HDMI lag a known problem? Can this be fixed?

root@coyote:~# dmesg | egrep vgapci\|pcm
vgapci0: <VGA-compatible display> port 0x3000-0x303f mem 0xe0000000-0xe03fffff,0xc0000000-0xdfffffff irq 16 at device 2.0 on pci0
agp0: <IvyBridge mobile GT2 IG> on vgapci0
pcm0: <Realtek ALC888 (Rear Analog)> at nid 20 and 24 on hdaa0
pcm1: <Realtek ALC888 (Rear Digital)> at nid 30 and 31 on hdaa0
pcm2: <Intel Panther Point (HDMI/DP 8ch)> at nid 6 on hdaa1
pcm3: <Intel Panther Point (HDMI/DP 8ch)> at nid 7 on hdaa1
drmn0: <Intel IvyBridge (M)> on vgapci0

Cheers,
Uli