HDMI audio stops working when X starts

[paul at intl.sbrk.co.uk]

On Wed, Apr 22, 2009 at 04:18:02PM +0800, Zhenyu Wang wrote:
> On 2009.04.22 03:37:00 -0400, paul at intl.sbrk.co.uk wrote:
> > On Wed, Apr 22, 2009 at 09:45:50AM +0800, Zhenyu Wang wrote:
> > > On 2009.04.16 05:54:05 -0400, paul at intl.sbrk.co.uk wrote:
> > 
> > > > The problem is that HDMI audio works fine until I start X. The
> > > > driver for the Intel(R) Mobile Intel? GM45 Express Chipset
> > > > loads and I see a message in dmesg:
> > > > HDMI hot plug event: Presence_Detect=0 ELD_Valid=1
> > > > and sound output ceases. If I stop X, then I get
> > > > HDMI hot plug event: Presence_Detect=1 ELD_Valid=1
> > > > and sound output returns.
> >  
> > > What's your kernel version?  Ma Ling's patch in linus tree
> > > "drm/i915: sync hdmi detection by hdmi identifier with 2D" should
> > > have fixed this by detect hdmi sink correctly.
> > 
> > I've just tried it on 2.6.29.1 with the same symptoms. I can
> > see the sync hdmi detection code in drm/i915/*.c.
> > 
> > Is the problem that it sees the audio sink and assigns it
> > for the video driver taking it away from the alsa driver?
> > 
> 
> I don't think the fix is in 2.6.29.1, pls try 2.6.30-rc3 now.

The same:
startx:
[drm] Initialized drm 1.1.0 20060810
pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
pci 0000:00:02.0: setting latency timer to 64
pci 0000:00:02.0: irq 30 for MSI/MSI-X
[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
HDMI hot plug event: Presence_Detect=0 ELD_Valid=1

stopx:
HDMI hot plug event: Presence_Detect=1 ELD_Valid=1
ALSA sound/pci/hda/hda_eld.c:264: HDMI: Unknown ELD version 1
[drm:gm45_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 1

$ uname -r
2.6.30-rc3
$ cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.19.
$ lsmod|grep hdmi
snd_hda_codec_intelhdmi    14320  1 
snd_hda_codec          62304  3 snd_hda_codec_intelhdmi,snd_hda_codec_realtek,snd_hda_intel
snd                    64920  14 snd_hda_codec_intelhdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq_dummy,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
$ lspci -nn|egrep -i 'audio|graph'
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
00:1b.0 Audio device [0403]: Intel Corporation 82801I (ICH9 Family) HD Audio Controller [8086:293e] (rev 03)

xf86-video-intel-2.7.0 and libdrm-2.4.9

Paul