Windows · Windows 7

Windows 7 64bit and Sigma Tel High Definition Audio CODEC Problems

I recently upgraded my work laptop to the latest and greatest edition of Microsoft’s primary operating system Windows 7, 64bit. Seeing this is the first time I am migrating fulltime to a 64bit Windows system I have decided to keep my old 32bit Windows Vista partition on the same laptop using dual partitions. Everything with the installation of Windows 7 has worked flawlessly accept for one major problem has an easy fix.

My Dell XPS M1330 laptop uses an audio device referred to as the Sigma Tel High Definition Audio CODEC. Unfortunately after installing a fresh copy of Windows 7 64 bit no audio could be heard, even though the volume was up at full and all the device drivers reported did not any problems.

If you search the internet for Sigma Te High Definition Audio there is not much in the way of helpful results. Thankfully I found a simple solution; you simply have to manually install the Windows Vista, Sigma Tel HD Audio drivers onto your 64bit Windows 7. It seems the default drivers included in Windows 7 are maybe only 32 bit compatible? Dell thankfully offers set of Windows Vista drivers from their websiteDell thankfully offers a set of Windows Vista drivers from their FTP site that supports both 32bit and 64bit. And while they are dated 13th August 2007 they work fine in Windows 7.

As mentioned in this article’s comments some people have been expiriencing problems with the combination of Skype, Windows 7 and the Sigma Drivers. Skype seem to be aware of the problem but currently do not offer a solution other than to suggest that you make sure Skype and your drivers are up to date.

Why am I experiencing sound/video problems when using Skype with Windows 7? We are aware that not all sound and/or video drivers are compatible with Windows 7 when using Skype.

Device Driver


34 thoughts on “Windows 7 64bit and Sigma Tel High Definition Audio CODEC Problems

  1. good on you, that is the solution i found as well. the problem is, these drivers work with all applications i have EXCEPT SKYPE. the skype website does not offer any clues other than saying skype is aware that not all sound devices work with the combination windows 7/skype. has anyone got any suggestions? thanks

    1. Same problem with my Dell Inspiron 1525 running Windows 7 32-bit and using Skype.
      Everything else works except Skype; even using a headset plugged into front Audio and Microphone jack.
      Skype sees no speakers and microphone present on the laptop. One reason might be new feature called Default Communication Device together with Default Device for recording in Sound settings.

      1. I just called DELL for the same question and the tech said he wouldn’t give me any advice on operating systems the computer didnt’ ship with. Vista is old and I upgraded to 7 professional 64. My sound card stopped working and Dell’s drivers for the XPS do not work. I asked the guy if maybe not supporting the system beyond 6 months of purchasing was maybe a problem and he says “Not my problem”.. I have this actually on record and will fire it over to better business. Dell support is legendary aweful. Not Sigmatel nor realtek drivers will make my sound stop crackling. THe best way to solve this problem is to NEVER BUY DELL.

    2. @Ben Garrett,

      Dear Ben Garrett,

      Thanks a lot for your post for the audio driver solution

      it helped me a lot.
      I had also the same problem.
      Thanks a lot again

      Hyderabad, India

  2. I know that another “me too” isn’t helpful, but I have the exact same issue… just upgraded to Windows 7, have the latest Sigmatel driver from the Dell website, the latest version of Skype, and whenever I try to start a video or audio call, Skype will either crash or the audio simply won’t work. I am able to use my bluetooth headset to talk, but if a video call is open (and ONLY when a video call is open) none of the other audio on my computer will work anyway. What’s the deal here?

  3. Months of waiting and searching for solution how to make Skype work with Sigmatel driver on my Dell Inspiron 1525 laptop running Windows 7 have produced no result. Unless Skype does not fix this in their new version release, I see no other solution. Maybe some of you have found the “workaround”. If so, please post your findings.
    Happy Holidays to all.

  4. I had the same problem Dell Inspiron 1720 upgraded to Windows 7 32 bit. All audio worked fine except Skype.

    I reloaded the driver from the Dell site at:

    Says it is for Vista, but fixed my Skpye problem in Windows 7

    SIGMATEL STAC 92XX C-Major HD Audio
    Release Date: 6/13/2008
    Version:, A03

  5. Hi. The link above doesn´t work anymore. Can anyone tell me how I could get that driver? Can`t find the one from 2007. The only driver (64bit) I can get is form 2008 but that is now working on my Dell XPS M1330 with Windows 7 Ultimate 64bit.

  6. I should give up on my case. Everything I tried failed to make Skype work on my Inspiron 1525 Windows 7 32bit. SigmaTel is out of business – no support there; Dell does not support this model on Windows 7 – they do not care; newest Skype BETA does not address this issue – why should they; every driver I tried ended with the same result – can’t recognize webcam and/or sound card. I am so mad because of this stupidity.

  7. hi i have a problem with my dell vostro 1400 audio, i have upgraded it from w vista to windows 7.
    is anyone have thesame problem..please PM me..



  8. I uninstalled the Sigma Tel driver and installed Microsoft driver (happens automatically, if no driver installed) on my DELL Inspirion 1420. Skype is running well. But I have no sound from my speakers, I have to use the headphones. Hopefully the new version of skype resolves our problem.

    If anybody has his DELL laptop with Windows 7 and Sigma Tel drivers running, please post…

    What driver do the laptops have, which are already sold with Windows 7? Can we use it as well???

  9. Thanks for post Andy. I uninstalled SigmaTel driver and it was replaced by “Intel® High Definition Audio HDMI” driver automatically. Audio works fine with Skype now; even trough laptops build in speakers and trough headphone jacks.
    However; build in microphone array does not work at all. It is not found by device manager anymore and is not available in Sound properties. I still have an option for a Microphone “High definition Audio Device” trough jack and that one works fine.
    My opinion is that this problem with SigmaTel drivers on Windows 7 will not be resolved at all.
    As in my previous post; there is no solution available for very long time now by none of the parties that could work of fixing this. SigmaTel is out of the business in PC audio since 2006 and no new laptops that are running Windows 7 have their drivers or devices build in. Since February 2009 they are officially dead and exist no more.
    Good luck to all.

  10. I have found that Dell sound drivers version R147073 work with Windows 7 and do NOT cause Skype audio to break up. I would recommend also disabling Audio Enhancements (open Sound panel, double click on speakers, advanced).

    Tested on Inspiron 1420 Windows 7 64 bit.

    Hope this helps.

  11. R147073 driver did not work for me. Same Skype error message that no audio device can be find just like with any other SigmaTel driver I have tried.
    In my previous post; I stated that SigmaTel drivers have been replaced by “Intel® High Definition Audio HDMI” driver once uninstalled. That is not the case as I have made a mistake, sorry about it.
    After uninstallation of SigmaTel driver; Windows 7 installs “High Definition Audio Device” driver by Microsoft – just like Andy stated in his post. I can use Skype but with microphone connected through the jack; as build in microphone array (next to the camera) cannot be found without SigmaTel driver.
    We have lost a battle; but certainly not the war.

    1. Hello guys,

      I am in the same problem but with 64 bit windows 7, what i have discovered is that driver is only working for S/PDIF and some how you can only use the front output for headphones like speakers and depends of the motherboard on most of them you can use mic as well but on windows 7 32bit i dont have this problems at all everything works fine as I went to realtech site and downloaded the latest HD Sound drivers!
      Will keep you posted, there is an solution.

  12. Big thanks to Reborn for the link, had recently upgraded Inspiron 1720 from vista 32bit to win 7 ultimate and was having same issues with skype but downloaded and installed his suggested driver and…. yipee it worked!! cheers

  13. Unfortunately, drivers that Reborn posted link for – did not work on my Dell Inspiron 1525.
    After running the setup file I get the message: “This is not the correct audio driver for this system. The installer will now exit.”
    Driver is a motherboard specific and it will work with those MoBos posted in “read me” file that comes with installation.
    As of today I have not found a single SigmaTel driver for Windows 7; only for Vista.
    My quest continues. Good luck to all.

    1. Yes The drivers are specific for the certain motherboards but. So far we have discovered that certain software is written and in .inf file there is no statement about your MOBO or computer by it self so when you will unpack to install it is unpacked ether in temp folder or in Cab folder or Drivers folder as we know ( i think :)) So you can go and with in Manual install option “Have Disk” you ca resolve that sometimes stupid software glitch ! BTW I have to announce that this posted drivers are for the motherboards with 945,965,975 graphic built in/or not chip-sets for Intel D or Very First Intel Dual Core Procs. For the Newer motherboards you have the other one that worked for me and I have download from Realtek website directly ! AND ONE MORE COMMENT : Yes there is no still a Real Good Driver Written For Win 7 Because The drivers are in 98% fully compatible with STUPID Vista’s OP SYS. In one hand It is good.
      I will post the other Newer Driver set so good luck to everybody in DRIVER JOURNEY! Learn On Fly And Never Get Dry! POST Pls!
      Have Fun Guys

  14. i’m having the same prob. in my case i had no prob for 3 monthes (since i upgraded to 7). the prob occured few days ago, when the laptop(inspiron 1525) was connected to the TV via a hdmi cable and using Skype at the same time. from that moment everything went wrong. I uninstalled the drivers ver A03 and tried to install the A02 ver; and nothing. I installed the last Skype 4.2; and nothing. but i’ll keep on trying.

  15. Hello all.

    I found solution and fixed all of my problems!

    As per this post:
    * Go to the bottom of page 4!

    Use this driver:

    IDT took over SigmaTel – R226903 driver works GREAT!
    I cannot be more happier that now everything works like it should!
    Good luck to all!

  16. It has been a month now and driver work flawlessly.
    Only thing I had to do is to disable “Automatically adjust microphone settings” in Skype; as my build in microphone array is lowering the volume all the way down if this setting is turned on.
    I must say that I have not tried using HDMI out to see if driver works there too.

  17. Hi I upgrade my home PC with Windows 7 with PI945GCM Mercury Mother board.
    I install the Sound driver automatically. When I play the sound its work fine from the back panel Not able to play the MIC from back panel. GO to the Control panel check the sound setting I can see the all the options for sound setting with front panel and back panel. But MIC is showing only front panel only not able to change to Back panel at all. Their is no option to change the Panel option on control panel.

    I have Sigmatel IDT High Definition Audio.

    I need a help to play the back panel mic i dont have Front panel to used it. But mother board having the front panel port to connect the Hardware. But I not using.

  18. hi, i got a dell xps 710 that i just went from xp pro 32 bit to win 7 ultimate 64 bit and i keep getting a code 10 on my IDT High Definition Audio CODEC. My sound is all messed up and i keep reading all the blogs that i can find about it and i can’t get a working driver anywhere. I tryed going to dell site and i can’t use my service tag anymore b/c of the upgrade they only give me drivers for xp 32bit. If someone could please help me out that would be awesome.

  19. hi, i’ve had the same problem (hard-installed mic will not work with skype) and tried to use duke’s fix of the new non-sigmatel driver. the problem is when i try to install the new driver software, i get an error message that says i must uninstall the sigmatel drivers before i can access the new installer. I’ve searched all drives on my computer and have found no sigmatel drivers, only the microsoft high definition audio device drivers. upon uninstalling both, the folder they are located in (sound, video and game controllers) disappears until the drivers are automatically redownloaded from the internet. if i disconnect my laptop from the network, the folder disappears entirely, yet the IDT driver still displays the same error message. how do i address this?

    1. I’ve retired use of Windows 7 on my old laptop so I can’t help but maybe there is something remaining in the Windows registry that is causing the conflict?

  20. ben – this could be, how would i attack that problem? and if it does turn out that’s the issue, will the microsoft auto-installed driver go away if i try to install a third-party one? thanks!

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