Query on Intel IGP and audio over displayport

Query on Intel IGP and audio over displayport

[Mikael Öhman]

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Hello.
I was wondering if it was possible to send audio over displayport using a
Core i5 661 (Clarkdale) IGP.
I have seen some charts indicating that the hardware actually supports it,
but I'm not even sure if I should ask here or perhaps to some ALSA mailing
list.
On google I have only found things related to DP->HMDI with audio, which I
don't need.

aplay only lists
card 0: Intel [HDA Intel], device 0: ALC889 Analog [ALC889 Analog]
card 0: Intel [HDA Intel], device 1: ALC889 Digital [ALC889 Digital]
card 0: Intel [HDA Intel], device 3: INTEL HDMI 0 [INTEL HDMI 0]
card 0: Intel [HDA Intel], device 7: INTEL HDMI 1 [INTEL HDMI 1]
and naturally I've tried them all, with no sound.

I'm using Debian unstable, and xserver-xorg-video-intel 2.11  (everything
else also uptodate with Sid if that matters.)

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Re: Query on Intel IGP and audio over displayport

[Zhenyu Wang]

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On 2010.05.15 03:46:35 +0200, Mikael Öhman wrote:
> Hello.
> I was wondering if it was possible to send audio over displayport using a Core
> i5 661 (Clarkdale) IGP.
> I have seen some charts indicating that the hardware actually supports it, but
> I'm not even sure if I should ask here or perhaps to some ALSA mailing list.
> On google I have only found things related to DP->HMDI with audio, which I
> don't need.

Yeah, we're looking into that actually. And current difficult is how to 
identify the DP sink device really has audio support. One is to use EDID
CEA ext 'basic audio' feature, and another I've tried is to parse DPCD
downstream device type. Unfortunately the DP monitors we have now don't
have sane indication for them all, so we don't have good hardware to verify
this (also tried windows driver but still failed with DP audio on it). 

Maybe we should just use EDID to determine whether enable audio or not.

> 
> aplay only lists
> card 0: Intel [HDA Intel], device 0: ALC889 Analog [ALC889 Analog]
> card 0: Intel [HDA Intel], device 1: ALC889 Digital [ALC889 Digital]
> card 0: Intel [HDA Intel], device 3: INTEL HDMI 0 [INTEL HDMI 0]
> card 0: Intel [HDA Intel], device 7: INTEL HDMI 1 [INTEL HDMI 1]
> and naturally I've tried them all, with no sound.
> 
> I'm using Debian unstable, and xserver-xorg-video-intel 2.11  (everything else
> also uptodate with Sid if that matters.)
> 
> 

You may try to force 'has_audio' to true in intel_dp.c, and try with HDA
HDMI codec. Let me know if that'll work for you, and what's your monitor model?

-- 
Open Source Technology Center, Intel ltd.

$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827

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Re: Query on Intel IGP and audio over displayport

[Mikael Öhman]

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On Mon, May 17, 2010 at 3:16 AM, Zhenyu Wang <zhenyuw@linux.intel.com>
wrote:
>
> On 2010.05.15 03:46:35 +0200, Mikael Öhman wrote:
> > Hello.
> > I was wondering if it was possible to send audio over displayport using
a Core
> > i5 661 (Clarkdale) IGP.
> > I have seen some charts indicating that the hardware actually supports
it, but
> > I'm not even sure if I should ask here or perhaps to some ALSA mailing
list.
> > On google I have only found things related to DP->HMDI with audio, which
I
> > don't need.
>
> Yeah, we're looking into that actually. And current difficult is how to
> identify the DP sink device really has audio support. One is to use EDID
> CEA ext 'basic audio' feature, and another I've tried is to parse DPCD
> downstream device type. Unfortunately the DP monitors we have now don't
> have sane indication for them all, so we don't have good hardware to
verify
> this (also tried windows driver but still failed with DP audio on it).
>
> Maybe we should just use EDID to determine whether enable audio or not.

Xorg.log do contain some EDID output. I don't know what tool i should use
otherwise. get-edid gives me some errors (and it tries to parse my second
monitor only, I need to disconnect it when i get home). It doesn't give me
any more information anyway.

(II) intel(0): EDID for output DP3
(II) intel(0): Manufacturer: NEC  Model: 677a  Serial#: 0
(II) intel(0): Year: 2009  Week: 49
(II) intel(0): EDID Version: 1.4
(II) intel(0): Digital Display Input
(II) intel(0): 8 bits per channel
(II) intel(0): Digital interface is DisplayPort
snip
(II) intel(0): Monitor name: EA231WMi
(II) intel(0): Serial No: 9Z104746NB
(II) intel(0): Number of EDID sections to follow: 1
(II) intel(0): EDID (in hex):
(II) intel(0): 00ffffffffffff0038a37a6700000000
(II) intel(0): 31130104a5331d78e2f805a4554d9d25
(II) intel(0): 125054bfef8081008140818081c09500
(II) intel(0): 9040b300a9c0023a801871382d40582c
(II) intel(0): 4500fe1f1100001e000000fd00384c1f
(II) intel(0): 5311000a202020202020000000fc0045
(II) intel(0): 41323331574d690a20202020000000ff
(II) intel(0): 00395a3130343734364e420a202001a5

If i read the specification for EDID correctly, 01 would specify 1 extension
block. The extension block doesn't seem to printed in Xorg.0.log


>
> >
> > aplay only lists
> > card 0: Intel [HDA Intel], device 0: ALC889 Analog [ALC889 Analog]
> > card 0: Intel [HDA Intel], device 1: ALC889 Digital [ALC889 Digital]
> > card 0: Intel [HDA Intel], device 3: INTEL HDMI 0 [INTEL HDMI 0]
> > card 0: Intel [HDA Intel], device 7: INTEL HDMI 1 [INTEL HDMI 1]
> > and naturally I've tried them all, with no sound.
> >
> > I'm using Debian unstable, and xserver-xorg-video-intel 2.11
(everything else
> > also uptodate with Sid if that matters.)
> >
> >
>
> You may try to force 'has_audio' to true in intel_dp.c, and try with HDA
> HDMI codec. Let me know if that'll work for you, and what's your monitor
model?
>

I have a NEC EA231WMi
I just accidentally found that my monitor had the option to select sound
from DP (and I can't test it with any other equipment).
I will test it be hardcoding has_audio=true tonight.

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