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Next problem --- Audio over DVI to HDMI

  

 
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ross.jemima at gmail

Mar 6, 2010, 2:14 AM

Post #1 of 20 (3284 views)
Permalink
Next problem --- Audio over DVI to HDMI
Hi all,

New problem to tackle now.

I'd like to know if its possible to run audio over my DVI to HDMI cable
to my TV. I've been reading a bit of stuff and getting a little
confused. Also when I upgraded from Jaunty to Karmic I didn't have any
sound and had to change my sound settings from ALSA:default to
ALSA:Surround51. I'm not sure if thats because it installed PulseAudio
and it shouldn't be used with Myth. One of the wikis say its not
compatible with Myth.

Currently there is no proper sound in any application. However there
are hisses clicks and pops periodically (every 10 seconds or so) which
increase in frequency when trying to watch recordings in Myth.

Any ideas on how to approach this?

Additional information.
Audio 8280lI HD Audio Controller Intel onboard
Ubuntu 9.10 AMD_64.
JYA's Nvidia drivers
Geforce 9400 GT

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jfpn at clearfield

Mar 6, 2010, 2:37 AM

Post #2 of 20 (3224 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
> I'd like to know if its possible to run audio over my DVI to HDMI cable
> to my TV. I've been reading a bit of stuff and getting a little

Apparently you can.

1st step would to make sure your hdmi is not muted.

/usr/bin/amixer -q -c 0 sset 'Master',0 unmute && /usr/bin/amixer -q -c 0
sset 'Master',0 100
/usr/bin/amixer -q -c 0 sset 'IEC958 Default PCM',0 unmute
/usr/bin/amixer -q -c 0 sset 'IEC958',0 unmute && /usr/bin/amixer -q -c 0
sset 'IEC958',1 unmute
sudo alsactl store


From a really good guide for XBMC.

http://forum.xbmc.org/showthread.php?t=59877

Also useful is the app "speaker-test"

--
------------------------------------------------------------------------
Jean-Francois Pirus <jfp [at] clearfield> Technical Manager
Phone (+64-9) 358 2081 Clearfield Software Ltd
Fax (+64-9) 358 2083 1st Floor 8-10 Whitaker Place
Mob (+64-21) 640 779 P O Box 3901 Auckland, New Zealand
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james6.0 at gmail

Mar 6, 2010, 5:07 AM

Post #3 of 20 (3222 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sat, Mar 6, 2010 at 11:14 PM, Ross and Jemima Knudsen <
ross.jemima [at] gmail> wrote:

> Hi all,
>
> New problem to tackle now.
>
> I'd like to know if its possible to run audio over my DVI to HDMI cable
> to my TV.
>

Uh... not from the DVI port... You'd need to feed SPDIF into the HDMI
interface somehow, as well as DVI-D. I dont think there are adaptors that do
it, but maybe they are.

One option is to buy a video card with HDMI output. This will come with a
cable to connect the video card internally to your motherboard's SPDIF
header


nick.rout at gmail

Mar 6, 2010, 11:51 AM

Post #4 of 20 (3219 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sun, Mar 7, 2010 at 2:07 AM, James Gray <james6.0 [at] gmail> wrote:
>
>
> On Sat, Mar 6, 2010 at 11:14 PM, Ross and Jemima Knudsen
> <ross.jemima [at] gmail> wrote:
>>
>> Hi all,
>>
>> New problem to tackle now.
>>
>> I'd like to know if its possible to run audio over my DVI to HDMI cable
>> to my TV.
>
> Uh... not from the DVI port...


yes you can. Some chipsets will let you do this. dvi and hdmi are
electrically equivalent and the plugs don't care what is in the
digital signal they carry.

If it's an integrated video chipset (ie on motherboard) it may not
need any physical connection set up. If it's a discrete graphics card
you probably need a cable from the motherboard spdif header to the
graphics card.

But it depends on your hardware!

I thought surround51 was for setups where you have 6 analogue speakers
connected to your computer, eg by three 3.5mm stereo plugs. I think
you should be looking for alsa:iec958. But what does aplay -L and
aplay -l say? (that's upper and lowercase -L)

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ross.jemima at gmail

Mar 6, 2010, 12:46 PM

Post #5 of 20 (3212 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
Nick Rout wrote:
> yes you can. Some chipsets will let you do this. dvi and hdmi are
> electrically equivalent and the plugs don't care what is in the
> digital signal they carry.
>
> If it's an integrated video chipset (ie on motherboard) it may not
> need any physical connection set up. If it's a discrete graphics card
> you probably need a cable from the motherboard spdif header to the
> graphics card.
>
> But it depends on your hardware!
>
> I thought surround51 was for setups where you have 6 analogue speakers
> connected to your computer, eg by three 3.5mm stereo plugs. I think
> you should be looking for alsa:iec958. But what does aplay -L and
> aplay -l say? (that's upper and lowercase -L)
>

I posted the output of those commands here:
http://pastebin.com/2ywM4Ppc

The graphics card is discrete but I can't remember the brand, I'll have
to have a look and might open the case to see if there is a spdif header
on the card.

As for ASLA:surround51, I remember reading somewhere that that was a
'fix' for the problem I encountered when I upgraded. I can't remember
where the post was though. I obviously need to change it as you
described. I have been running analogue stereo speakers using
ALSA:default on 0.21/Jaunty but when I upgraded to either Karmic or 0.22
the sound stopped working and only changing to ALSA:surround51 gave me
anything. But that won't matter if I can get the sound over the DVI cable!

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duncan.kennington at gmail

Mar 6, 2010, 1:23 PM

Post #6 of 20 (3213 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On 6 March 2010 23:14, Ross and Jemima Knudsen <ross.jemima [at] gmail>wrote:

> I'd like to know if its possible to run audio over my DVI to HDMI cable
> to my TV. I've been reading a bit of stuff and getting a little
> confused. Also when I upgraded from Jaunty to Karmic I didn't have any
> sound and had to change my sound settings from ALSA:default to
> ALSA:Surround51. I'm not sure if thats because it installed PulseAudio
> and it shouldn't be used with Myth. One of the wikis say its not
> compatible with Myth.
>
>
Another option, not cheap though, is to bring the DVI and SPDIF audio
together using something like
http://www.trademe.co.nz/Electronics-photography/TVs/Cables-aerials/auction-274805228.htm


nick.rout at gmail

Mar 6, 2010, 1:34 PM

Post #7 of 20 (3218 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sun, Mar 7, 2010 at 9:46 AM, Ross and Jemima Knudsen
<ross.jemima [at] gmail> wrote:
> Nick Rout wrote:
>  > yes you can. Some chipsets will let you do this. dvi and hdmi are
>> electrically equivalent and the plugs don't care what is in the
>> digital signal they carry.
>>
>> If it's an integrated video chipset (ie on motherboard) it may not
>> need any physical connection set up. If it's a discrete graphics card
>> you probably need a cable from the motherboard spdif header to the
>> graphics card.
>>
>> But it depends on your hardware!
>>
>> I thought surround51 was for setups where you have 6 analogue speakers
>> connected to your computer, eg by three 3.5mm stereo plugs. I think
>> you should be looking for alsa:iec958. But what does aplay -L and
>> aplay -l say? (that's upper and lowercase -L)
>>
>
> I posted the output of those commands here:
> http://pastebin.com/2ywM4Ppc
>
> The graphics card is discrete but I can't remember the brand, I'll have
> to have a look and might open the case to see if there is a spdif header
> on the card.
>
> As for ASLA:surround51, I remember reading somewhere that that was a
> 'fix' for the problem I encountered when I upgraded.

try alsa:front for two channel analogue.

> I can't remember
> where the post was though.  I obviously need to change it as you
> described.  I have been running analogue stereo speakers using
> ALSA:default on 0.21/Jaunty but when I upgraded to either Karmic or 0.22
> the sound stopped working and only changing to ALSA:surround51 gave me
> anything.  But that won't matter if I can get the sound over the DVI cable!
>
> _______________________________________________
> mythtvnz mailing list
> mythtvnz [at] lists
> http://lists.ourshack.com/mailman/listinfo/mythtvnz
> Archives http://www.gossamer-threads.com/lists/mythtv/mythtvnz/
>

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tortise at paradise

Mar 6, 2010, 2:01 PM

Post #8 of 20 (3212 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
----- Original Message -----
From: "Ross and Jemima Knudsen" <ross.jemima [at] gmail>
To: "MythTV in NZ" <mythtvnz [at] lists>
Sent: Sunday, March 07, 2010 9:46 AM
Subject: Re: [mythtvnz] Next problem --- Audio over DVI to HDMI


Can I ask a fundamental question, why would you want to?

Obvious initial answer is it conveys audio and video over one cable, presumably into a LCD TV.

However, we are talking good quality HD video, high quality audio, while most TV's have generally poor audio reproduction, some of
the largest TV's possibly excepted.

Anyone wanting sound quality in line with their visual quality should consider a separate audio system.

At that point a separate audio input is going to be required. One obvious exception will be a switching HDMI amp, that is wired in
between mythtv and the screen, however that's not been described in this case.

Is the OP planning on using the TV's audio and want audio with video over DVI / HDMI for that reason?


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nick.rout at gmail

Mar 6, 2010, 2:18 PM

Post #9 of 20 (3213 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sun, Mar 7, 2010 at 11:01 AM, Tortise <tortise [at] paradise> wrote:
> ----- Original Message -----
> From: "Ross and Jemima Knudsen" <ross.jemima [at] gmail>
> To: "MythTV in NZ" <mythtvnz [at] lists>
> Sent: Sunday, March 07, 2010 9:46 AM
> Subject: Re: [mythtvnz] Next problem --- Audio over DVI to HDMI
>
>
> Can I ask a fundamental question, why would you want to?


reduce cable clutter? (maybe thats what you are meaning in your next sentence)
"because he can"
because his soundcard may be crap?

>
> Obvious initial answer is it conveys audio and video over one cable, presumably into a LCD TV.
>
> However, we are talking good quality HD video,

Are we? We may be talking SD or we may be talking even crappier
transcoded files from a DVD or downloaded?

>high quality audio, while most TV's have generally poor audio reproduction, some of
> the largest TV's possibly excepted.
>
> Anyone wanting sound quality in line with their visual quality should consider a separate audio system.
>

Agreed.

> At that point a separate audio input is going to be required.  One obvious exception will be a switching HDMI amp,

Yes I think for a lounge/home theatre that is correct. But for a
bedroom cable clutter and tidyness, along with the much vaunted WAF
may be more important :)

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tortise at paradise

Mar 6, 2010, 2:43 PM

Post #10 of 20 (3202 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
----- Original Message -----
From: "Nick Rout" <nick.rout [at] gmail>
To: "MythTV in NZ" <mythtvnz [at] lists>
Sent: Sunday, March 07, 2010 11:18 AM
Subject: Re: [mythtvnz] Next problem --- Audio over DVI to HDMI


>> Can I ask a fundamental question, why would you want to?

>reduce cable clutter? (maybe thats what you are meaning in your next sentence)

yes.

>"because he can"

I could understand that reason.

>because his soundcard may be crap?

Did you read the OP's posts? OP tells us what it is, see below. Are you saying that is a crap soundcard?

>> However, we are talking good quality HD video,

>Are we? We may be talking SD or we may be talking even crappier transcoded files from a DVD or downloaded?


Nick, the OP has told us:

Additional information.
Audio 8280lI HD Audio Controller Intel onboard
Ubuntu 9.10 AMD_64.
JYA's Nvidia drivers
Geforce 9400 GT


Nick, do you believe the OP, having bought a 1080p display, won't be displaying any HD? I can't see anyone setting up this rig to
not do HD. (although it will give better SD than many older SD systems, by turning i into p. HD is free these days....)



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tortise at paradise

Mar 6, 2010, 2:43 PM

Post #11 of 20 (3203 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
----- Original Message -----
From: "Nick Rout" <nick.rout [at] gmail>
To: "MythTV in NZ" <mythtvnz [at] lists>
Sent: Sunday, March 07, 2010 11:18 AM
Subject: Re: [mythtvnz] Next problem --- Audio over DVI to HDMI


>> Can I ask a fundamental question, why would you want to?

>reduce cable clutter? (maybe thats what you are meaning in your next sentence)

yes.

>"because he can"

I could understand that reason.

>because his soundcard may be crap?

Did you read the OP's posts? OP tells us what it is, see below. Are you saying that is a crap soundcard?

>> However, we are talking good quality HD video,

>Are we? We may be talking SD or we may be talking even crappier transcoded files from a DVD or downloaded?


Nick, the OP has told us:

Additional information.
Audio 8280lI HD Audio Controller Intel onboard
Ubuntu 9.10 AMD_64.
JYA's Nvidia drivers
Geforce 9400 GT


Nick, do you believe the OP, having bought a 1080p display, won't be displaying any HD? I can't see anyone setting up this rig to
not do HD. (although it will give better SD than many older SD systems, by turning i into p. HD is free these days....)



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james6.0 at gmail

Mar 6, 2010, 3:25 PM

Post #12 of 20 (3203 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
>
> yes you can. Some chipsets will let you do this. dvi and hdmi are
> electrically equivalent and the plugs don't care what is in the
> digital signal they carry.
>
> No it isn't. HDMI = DVI-D for video + SPDIF for audio + a few other things
for control and content protection. DVI will not carry audio, it's a video
interface.

http://www.trademe.co.nz/Electronics-photography/TVs/Cables-aerials/auction-274805228.htmas
somebody linked to looks like the way to go for this


criggie at criggie

Mar 6, 2010, 3:55 PM

Post #13 of 20 (3205 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
James Gray wrote:
> yes you can. Some chipsets will let you do this. dvi and hdmi are
> electrically equivalent and the plugs don't care what is in the
> digital signal they carry.
>
> No it isn't. HDMI = DVI-D for video + SPDIF for audio + a few other
> things for control and content protection. DVI will not carry audio,
> it's a video interface.
>
> http://www.trademe.co.nz/Electronics-photography/TVs/Cables-aerials/auction-274805228.htm
> as somebody linked to looks like the way to go for this

If it works, that's quite cheap.

CDL has the same thing at over $300 ++
http://www.cdlnz.com/productimages/pdfs/hdmifc01.pdf

Also has the reverse item for the same price
http://www.cdlnz.com/productimages/pdfs/hdmifc05.pdf


There's even one that converts between plain old VGA+audio and HDMI for
around $240 ++
http://www.cdlnz.com/productimages/pdfs/hdmifc08.pdf


--
Criggie

http://criggie.dyndns.org/

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james6.0 at gmail

Mar 6, 2010, 4:55 PM

Post #14 of 20 (3192 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sun, Mar 7, 2010 at 12:25 PM, James Gray <james6.0 [at] gmail> wrote:

> yes you can. Some chipsets will let you do this. dvi and hdmi are
>> electrically equivalent and the plugs don't care what is in the
>> digital signal they carry.
>>
>> No it isn't. HDMI = DVI-D for video + SPDIF for audio + a few other things
> for control and content protection. DVI will not carry audio, it's a video
> interface.
>
>
> http://www.trademe.co.nz/Electronics-photography/TVs/Cables-aerials/auction-274805228.htmas somebody linked to looks like the way to go for this
>


Actually, I stand corrected on this earlier assertion. Apparently the
GeForce 200 and Radeon R600 series will output HDMI data though the DVI
port... If you have such a card then you can use it in this manner.

That said, by the looks of it this is a case of a particular design sending
HDMI data from a DVI port, rather than "DVI can carry audio". The exception
rather than the rule.


nick.rout at gmail

Mar 6, 2010, 5:15 PM

Post #15 of 20 (3201 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On Sun, Mar 7, 2010 at 11:43 AM, Tortise <tortise [at] paradise> wrote:
> ----- Original Message -----
> From: "Nick Rout" <nick.rout [at] gmail>
> To: "MythTV in NZ" <mythtvnz [at] lists>
> Sent: Sunday, March 07, 2010 11:18 AM
> Subject: Re: [mythtvnz] Next problem --- Audio over DVI to HDMI
>
>
>>> Can I ask a fundamental question, why would you want to?
>
>>reduce cable clutter? (maybe thats what you are meaning in your next sentence)
>
> yes.
>
>>"because he can"
>
> I could understand that reason.
>
>>because his soundcard may be crap?
>
> Did you read the OP's posts?  OP tells us what it is, see below.  Are you saying that is a crap soundcard?

My comment was no reflection on his particular hardware, it's just a
generic reason why you may want to do audio over hdmi.

>
>>> However, we are talking good quality HD video,
>
>>Are we? We may be talking SD or we may be talking even crappier transcoded files from a DVD or downloaded?
>
>
> Nick, the OP has told us:
>
> Additional information.
> Audio 8280lI HD Audio Controller Intel onboard
> Ubuntu 9.10 AMD_64.
> JYA's Nvidia drivers
> Geforce 9400 GT
>
>
> Nick, do you believe the OP, having bought a 1080p display, won't be displaying any HD?  I can't see anyone setting up this rig to
> not do HD. (although it will give better SD than many older SD systems, by turning i into p. HD is free these days....)
>

Well it's hard to buy any panel less than 1080i/720p these days,
unless you go real low end/old stock. And yes I expect he will play
some 1080 video, but my point is we don't know what he is playing and
just because he has a 1080p TV doesn't mean he is playing high quality
material, or that he wants a surround system. My point is that you
shouldn't assume the source of his material is anything, the question
was "how to get audio over hdmi?", not "what is the hottest audio
setup for a media player?".

I have a 1080p Sony screen and I only record SD as I haven't set up dvb-t yet.

BTW any idea why I get your list messages twice?

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Douglas.Pearless at pearless

Mar 6, 2010, 7:56 PM

Post #16 of 20 (3185 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
I faced the same problem with my GT9400 card.

If it is a fanless one, be very careful as it may well have a fan
header and not a SPDIF header. A few people have toasted their
motherboard's audio this way connecting their graphic card's 12v fan
header to the SPDIF audio input on their motherboard. (Not me
thankfully).

I tried al sorts of methods, in the end I purchased a cheap NVIDIA
GT220 card which has integrated 8 channel digital audio over HDMI,
plus the graphics processor is faster than a GT9400 & disabled the
onboard integrated audio.

I had to patch ALSA to get it going, and I have audio fade every 10
minutes or so for about 2 seconds, BUT an engineer at NVIDIA has been
working with the ALSA developers and they are almost there with an
official patch for ALSA.

I then ran the HDMI over 2xcat5e using a pair of baluns and I am very
happy with this (my media server is 10m from my lounge). I also run a
wireless infrared remote using USB over cat5e which means later I can
add a USB hub in my lounge and plug in a DVD player, etc.

Just need to get the final patches for ALSA sorted...

Cheers
Douglas.

Quoting Ross and Jemima Knudsen <ross.jemima [at] gmail>:

> Nick Rout wrote:
> > yes you can. Some chipsets will let you do this. dvi and hdmi are
>> electrically equivalent and the plugs don't care what is in the
>> digital signal they carry.
>>
>> If it's an integrated video chipset (ie on motherboard) it may not
>> need any physical connection set up. If it's a discrete graphics card
>> you probably need a cable from the motherboard spdif header to the
>> graphics card.
>>
>> But it depends on your hardware!
>>
>> I thought surround51 was for setups where you have 6 analogue speakers
>> connected to your computer, eg by three 3.5mm stereo plugs. I think
>> you should be looking for alsa:iec958. But what does aplay -L and
>> aplay -l say? (that's upper and lowercase -L)
>>
>
> I posted the output of those commands here:
> http://pastebin.com/2ywM4Ppc
>
> The graphics card is discrete but I can't remember the brand, I'll have
> to have a look and might open the case to see if there is a spdif header
> on the card.
>
> As for ASLA:surround51, I remember reading somewhere that that was a
> 'fix' for the problem I encountered when I upgraded. I can't remember
> where the post was though. I obviously need to change it as you
> described. I have been running analogue stereo speakers using
> ALSA:default on 0.21/Jaunty but when I upgraded to either Karmic or 0.22
> the sound stopped working and only changing to ALSA:surround51 gave me
> anything. But that won't matter if I can get the sound over the DVI cable!
>
> _______________________________________________
> mythtvnz mailing list
> mythtvnz [at] lists
> http://lists.ourshack.com/mailman/listinfo/mythtvnz
> Archives http://www.gossamer-threads.com/lists/mythtv/mythtvnz/
>





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ross.jemima at gmail

Mar 7, 2010, 12:23 AM

Post #17 of 20 (3171 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
Sorry guys,

I'm wanting to play back FreeviewHD recordings as well as DVDs and AV
files etc.

Since I've only got onboard sound (as I think onboard is adequate in
most cases on medium+ end MBs) so it may have limitations. I'm not
looking for a high spec sound system at this stage as the budget is
limited (hence going for the cheapest HD flatscreen I could find).

Basically the consensus is that I need SPDIF headers on my graphics and
sound cards and connect them to even have a chance of getting this to
work. I'll open the case sometime and post back about whether this is
going to be viable or not. However this post:
http://www.mythtv.org/wiki/Configuring_Analog_Sound_DVI_to_HDMI
seems to indicate that it should be possible to send analog sound
without headers. Anyone know anything about that?

The reason for wanting sound on the HDMI cable is because it simplifies
cabling and because most LCDs are expecting the sound to be sent with
the video. Telling the TV to take sound from another input doesn't sound
like its possible in a lot of cases and appears to be the case in my
situation. The Analogue sound input seems only to work when using the
VGA interface.

As an interesting side note. After solving the missing taskbar issue,
now when I boot up the TV says it is displaying DVI (even though there
is no DVI port, its on the HDMI input). Then in Ubuntu the taskbars are
missing again until I rung nvidia-settings and then the mode switches to
HDMI on the TV and it resizes the screen correctly. This happens
immediately on launching nvidia-settings without changing anything or
saving a new config. I think it must be because the basic hardware of
the graphics card is DVI and its not until the nvidia driver loads that
it can switch the output to HDMI over the DVI port.

PS Tortise I also get two of your posts.

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jonathan.hoskin at gmail

Mar 7, 2010, 12:19 PM

Post #18 of 20 (3118 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
>
> The reason for wanting sound on the HDMI cable is because it simplifies
> cabling and because most LCDs are expecting the sound to be sent with
> the video. Telling the TV to take sound from another input doesn't sound
> like its possible in a lot of cases and appears to be the case in my
> situation. The Analogue sound input seems only to work when using the
> VGA interface.
>

I have an older Panasonic 42" and nothing else. I tried for ages to do HDMI
audio. Between the loud pops and crackles when starting video, lack of AC3
support on the TV and the occasional complete loss of audio I gave up and
went back to analog.

Because I like to use the volume control on the Myth remote (and not on the
TV remote), I had to turn on the software mixer, which in my case was fairly
craptastic when dealing with digital audio.




> Then in Ubuntu the taskbars are
> missing again until I rung nvidia-settings and then the mode switches to
> HDMI on the TV and it resizes the screen correctly. This happens
> immediately on launching nvidia-settings without changing anything or
> saving a new config.


Yep, this happened to me too. You need to run a startup script which quietly
loads up the nvidia settings when Gnome starts.


First, just make sure you have a *~/.nvidia-settings-rc* file, with your
overscan settings already in them. This *should* already be present because
they load OK when you run nvidia-settings manually. Check for a line like
this (yours will probably say 100 I guess):

0/OverscanCompensation[DFP-0]=65


Then, create a Gnome startup file called *
~/.config/autostart/nvidia-settings.desktop*, then restart GDM or
logout/login or reboot:

[Desktop Entry]
Type=Application
Exec=nvidia-settings -l
Hidden=false
X-GNOME-Autostart-enabled=true
Name[en_NZ]=Nvidia Settings Apply
Name=Nvidia Settings Apply
Comment[en_NZ]=
Comment=


I'd be interested to hear how you get on.

Jonathan


ross.jemima at gmail

Mar 7, 2010, 12:52 PM

Post #19 of 20 (3107 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On 8 March 2010 09:19, Jonathan Hoskin <jonathan.hoskin [at] gmail> wrote:
> Because I like to use the volume control on the Myth remote (and not on the
> TV remote), I had to turn on the software mixer, which in my case was fairly
> craptastic when dealing with digital audio.

Nice adjective (craptastic) I'll have to remember that one. I'm also
hoping to reduce down to one remote as well. I was at my Mums
yesterday and they have a big 50" plasma with a receiver, sky, dvd
with hdd recorder which equates to about 4 remotes. They have a hard
time changing all the settings on each device to get it to function
correctly!

> Yep, this happened to me too. You need to run a startup script which quietly
> loads up the nvidia settings when Gnome starts.
>
> First, just make sure you have a ~/.nvidia-settings-rc file, with your
> overscan settings already in them. This *should* already be present because
> they load OK when you run nvidia-settings manually. Check for a line like
> this (yours will probably say 100 I guess):
> 0/OverscanCompensation[DFP-0]=65
>
> Then, create a Gnome startup file called
> ~/.config/autostart/nvidia-settings.desktop, then restart GDM or
> logout/login or reboot:
> [Desktop Entry]
> Type=Application
> Exec=nvidia-settings -l
> Hidden=false
> X-GNOME-Autostart-enabled=true
> Name[en_NZ]=Nvidia Settings Apply
> Name=Nvidia Settings Apply
> Comment[en_NZ]=
> Comment=
>
> I'd be interested to hear how you get on.
> Jonathan

Cheers for that Jonathan. I kind of seemed to have solved that
problem as well as the sound issue at the same time. When I posted
that link to the mythtv wiki I misunderstood what it was trying to do.
It actually was what I needed to do. Basically it was saying that
the nvidia drivers try to output sound on the DVI port regardless of
whether it has spdif headers or if they are even connected to the
sound card. This is obviously a pain because it sends an empty sound
channel to the TV over the DVI port and the TV doesn't look for audio
on any other port. So I implemented the suggested workaround and now
the TV recongises it as a DVI signal and will use the analog audio
input. Success!

Also as of a fresh boot this morning the screen didn't overscan
without having to go into nvidia-settings (if you have a similar setup
Jonathan you might consider looking into whether this might fix it).
Originally I was trying to send the sound over the DVI cable but since
my sound setup is lofi (rather than hifi) it will be adequate. When I
can be bothered I might check the headers etc. By the time I can
upgrade my sound setup I'll probably be ready for a new graphics card
anyway.

Cheers for everyone's help.

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jyavenard at gmail

Mar 7, 2010, 2:24 PM

Post #20 of 20 (3088 views)
Permalink
Re: Next problem --- Audio over DVI to HDMI [In reply to]
On 7 March 2010 10:25, James Gray <james6.0 [at] gmail> wrote:
>> yes you can. Some chipsets will let you do this. dvi and hdmi are
>> electrically equivalent and the plugs don't care what is in the
>> digital signal they carry.
>>
> No it isn't. HDMI = DVI-D for video + SPDIF for audio + a few other things
> for control and content protection. DVI will not carry audio, it's a video
> interface.

Damn ... I wonder under what kind of magic I have sound over my DVI
output then.... which I use every day (because all I had at the time
was a DVI->HDMI cable)

On a HDMI cable; you do not have a distinct path for the audio signal
; it's all embedded in the TMS stream. So if a HDMI cable can carry
sound, so can a DVI cable.

Some video card with both HDMI and DVI output; actually are outputting
exactly the same signal ; so you can get sound over the DVI interface.

This topic comes up every month ...


Jean-Yves

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