HDMI audio stops working when X starts

Zhenyu Wang zhenyuw at linux.intel.com
Tue Apr 21 18:45:50 PDT 2009

On 2009.04.16 05:54:05 -0400, paul at intl.sbrk.co.uk wrote:
> Hi,
> I've also sent this query to the alsa mailing list, but I think it's
> more to do with the video driver than with alsa.
> 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.
> >From /var/log/Xorg.0.log I see:
> Loading /usr/lib64/xorg/modules/drivers//intel_drv.so
> ..
> (II) Primary Device is: PCI 00 at 00:02:0
> Can someone tell me what this hot plug event signifies
> and is there anything I can do to stop it disabling HDMI
> audio?

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.

Open Source Technology Center, Intel ltd.

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