DVI to HDMI equals NO sound!



  • Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to HDVI on monitor. W8.1 PC

    I was brought into setup other stuff as well as diagnose why there was no sound on both new PCs.

    After checking the connections and testing with known good speakers I started digging into software and drivers.

    • I checked nVidia's software and there was a DVI audio link, so I disabled it.
    • Disabled nVidia drivers in the device manager under Sound
    • I checked all the settings for Realtek Audio manager and Windows sound manager
    • Contacted Tech Support and was told to update driver manually even thought Windows checked and said it had the latest and greatest.
    • Contact Tech Support again as I was disconnected after the reboot
    • When nothing worked, I was told I would have to send the PC's back
    • Finally was told I could use Best Buy Geek Squad first since they sold the PC

    By this time I was frustrated and had already Googled and found nothing. I still felt it was a hardware/software glitch.

    Last thing I did after thanking Support for their "awesomeness" was to disconnect the DVI to HDMI cord and connect the VGA cord. Tried to play Free Falling on YouTube and viola! Sound, glorious sound.

    Now can anyone explain WTF is going on here? Why would DVI to HDMI hijack the sound from the Realtek? Especially when I disabled it in the nVidia panel



  • It's HDMI on the card and DVI on the monitor? HDMI normally hijacks the sound. I've had that issue too. DVI can't carry sound, which is a huge pain. HDMI is basically a DVI + audio cable.



  • @scottalanmiller said:

    It's HDMI on the card and DVI on the monitor? HDMI normally hijacks the sound. I've had that issue too. DVI can't carry sound, which is a huge pain. HDMI is basically a DVI + audio cable.

    Card has output for VGA, DVI and HDMI

    nVidia has DVI audio in their control panel software



  • Contacted Best Buy Geek Squad and they were impressed that I figured it out as they would have suggested sending it back to Asus.



  • I wish I had a screenshot for you that shows the Audio tab with the DVI chosen to provide sound, but I will get one next time I am at the clients office.



  • @technobabble said:

    @scottalanmiller said:

    It's HDMI on the card and DVI on the monitor? HDMI normally hijacks the sound. I've had that issue too. DVI can't carry sound, which is a huge pain. HDMI is basically a DVI + audio cable.

    Card has output for VGA, DVI and HDMI

    nVidia has DVI audio in their control panel software

    DVI Audio? That's weird. I wonder how they are doing that.



  • @scottalanmiller I thought it was weird too.



  • I wonder if they are doing something proprietary or if there is a new standard that I don't know about (I don't keep up on DVI that much) or if they are mislabeling HDMI? I'm a little confused.



  • Can you clarify the connections? You said it's DVI to HDMI but then you said it's DVI at both ends.

    @technobabble said:

    Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to DVI on monitor. W8.1 PC

    So, which end has the HDMI, the monitor or the computer?



  • Here it is... apparently there is a means of putting audio onto the DVI cable so that when you convert to HDMI it is there. Basically, I think, they are bastardizing the DVI standard to make this work.

    http://www.techpowerup.com/forums/threads/audio-through-dvi.145343/



  • HDMI to DVI generally will be either one cable for video and the sound just dies after it starts going into the HDMI to DVI cable, or the DVI connection has a secondary connection for audio, usually a 3.5mm jack attached to the DVI cable with a little slack. Which do you have?



  • @thanksaj said:

    Can you clarify the connections? You said it's DVI to HDMI but then you said it's DVI at both ends.

    @technobabble said:

    Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to DVI on monitor. W8.1 PC

    So, which end has the HDMI, the monitor or the computer?

    Fixed: DVI out from video card to HDVI on monitor.



  • @technobabble said:

    @thanksaj said:

    Can you clarify the connections? You said it's DVI to HDMI but then you said it's DVI at both ends.

    @technobabble said:

    Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to DVI on monitor. W8.1 PC

    So, which end has the HDMI, the monitor or the computer?

    Fixed: DVI out from video card to HDVI on monitor.

    Ok, this is weird. I could see issues if you were doing it the other way around, but the card shouldn't have audio capabilities. The cable is its own thing. Can you get a screenshot of the Audio devices/sound devices in Device Manager?



  • @scottalanmiller said:

    Here it is... apparently there is a means of putting audio onto the DVI cable so that when you convert to HDMI it is there. Basically, I think, they are bastardizing the DVI standard to make this work.

    http://www.techpowerup.com/forums/threads/audio-through-dvi.145343/

    I had read about that a while back...so by connecting the cord from DVI to HDMI, why would I lose all sound? Was it the connection via 3.5mm jack?



  • @technobabble The DVI actually carries the audio. The system is basically using the DVI connector as an HDMI connector. So it sees an audio device plugged in.

    We've solve the mystery of why it wants to do it. Now the mystery is, why does turning it off on the card not turn it off?



  • @thanksaj said:

    @technobabble said:

    @thanksaj said:

    Can you clarify the connections? You said it's DVI to HDMI but then you said it's DVI at both ends.

    @technobabble said:

    Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to DVI on monitor. W8.1 PC

    So, which end has the HDMI, the monitor or the computer?

    Fixed: DVI out from video card to HDVI on monitor.

    Ok, this is weird. I could see issues if you were doing it the other way around, but the card shouldn't have audio capabilities. The cable is its own thing. Can you get a screenshot of the Audio devices/sound devices in Device Manager?

    I don't have it but I can tell you that both the nVidia manager software had DVI set to auto and under Sound in the device manager where was nVidia listings for sound. drivers



  • The nVidia driver could see the connection and kill the sound.



  • @scottalanmiller

    @scottalanmiller said:

    @technobabble The DVI actually carries the audio. The system is basically using the DVI connector as an HDMI connector. So it sees an audio device plugged in.

    We've solve the mystery of why it wants to do it. Now the mystery is, why does turning it off on the card not turn it off?

    Thanks @scottalanmiller for bringing the discussion back on track...this is what I has hoping to find out!



  • @technobabble said:

    @thanksaj said:

    @technobabble said:

    @thanksaj said:

    Can you clarify the connections? You said it's DVI to HDMI but then you said it's DVI at both ends.

    @technobabble said:

    Customer bought 2 new Asus M51AD PCs with nVidia Geforce GTX 750 1GB cards from Best Buy which came with HDMI capable monitors (one 24" and one 27"). So when the customer setup the PCs she used the DVI to HDMI connector. DVI out from video card to DVI on monitor. W8.1 PC

    So, which end has the HDMI, the monitor or the computer?

    Fixed: DVI out from video card to HDVI on monitor.

    Ok, this is weird. I could see issues if you were doing it the other way around, but the card shouldn't have audio capabilities. The cable is its own thing. Can you get a screenshot of the Audio devices/sound devices in Device Manager?

    I don't have it but I can tell you that both the nVidia manager software had DVI set to auto and under Sound in the device manager where was nVidia listings for sound. drivers

    I bet it was that auto setting. What were the manual choices?



  • @technobabble said:

    @scottalanmiller

    @scottalanmiller said:

    @technobabble The DVI actually carries the audio. The system is basically using the DVI connector as an HDMI connector. So it sees an audio device plugged in.

    We've solve the mystery of why it wants to do it. Now the mystery is, why does turning it off on the card not turn it off?

    Thanks @scottalanmiller for bringing the discussion back on track...this is what I has hoping to find out!

    You said you DISABLED the device under Windows Sound Playback Devices?



  • @Dashrender said:

    The nVidia driver could see the connection and kill the sound.

    @Dashrender I thought that too, but if I disabled the drivers in Devices manager and disabled in nVidia software no sound occured. How is that? Freaky...



  • I'm seeing a weird problem like that right this second..

    all of my normal sounds are coming out of my plugged in speakers, but for whatever reason, the webinar I'm watching is coming out of the internal HP speaker (hard to hear).



  • @thanksaj

    • I checked nVidia's software and there was a DVI audio link, so I disabled it.
    • Disabled nVidia drivers in the device manager under Sound


  • @thanksaj said:

    @technobabble said:

    @scottalanmiller

    @scottalanmiller said:

    @technobabble The DVI actually carries the audio. The system is basically using the DVI connector as an HDMI connector. So it sees an audio device plugged in.

    We've solve the mystery of why it wants to do it. Now the mystery is, why does turning it off on the card not turn it off?

    Thanks @scottalanmiller for bringing the discussion back on track...this is what I has hoping to find out!

    You said you DISABLED the device under Windows Sound Playback Devices?

    nope see message above



  • @Dashrender That's weird...is it running W8.1



  • @technobabble said:

    @Dashrender That's weird...is it running W8.1

    Yes



  • @Dashrender said:

    @technobabble said:

    @Dashrender That's weird...is it running W8.1

    Yes

    I really should have speakers on my work PC...I haven't had sound since since 2011 on my W7 PC. I mean I have earbuds connected for occasional music or webinar. I am usually surprised at the noises Windows makes when onsite with a clients PC.



  • That's odd. I have speakers on and I don't think that my Windows makes any sounds.



  • @Dashrender said:

    I'm seeing a weird problem like that right this second..

    all of my normal sounds are coming out of my plugged in speakers, but for whatever reason, the webinar I'm watching is coming out of the internal HP speaker (hard to hear).

    If it's using Webex or GoTo Meeting, it could be a presentation setting, like something you'd set in Skype.



  • Yeah I looked through those presentation settings, so far no changes.