Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The other day I decided to rebuild the software on my PC. starting with Windows XP, I did a fresh install, and proceeded to install all of the drivers until there were no "Unknown Devices" in the device manager.

Then I installed Service Pack 3, and all of a sudden, I have 4 unknown instances of:

"Audio Device on High Definition Audio Bus"

Why would these only show up after an install of Service Pack 3?

...this seems very odd!

share|improve this question
Was Service Pack 3 the only update? – Dave M Feb 25 '13 at 20:53
They would show up if the drivers were removed because the update was installed. Just install the drivers for this device. – Ramhound Feb 25 '13 at 20:58
@Ramhound, I don't know what the device is. My O/B sound card is disabled. I have an Alesis IO|26 FireWire production card and an X-Fi Titanium, but all drivers for those are present and correct! - Could it be to do with HDMI sound via my graphics card, maybe? – series0ne Feb 25 '13 at 23:13
@series0ne - I don't know what hardware you have on your system. If everything is working, then a couple unknown devices, isn't really a problem. – Ramhound Feb 26 '13 at 12:22
@Ramhound, Ah you would think so! But ever since installing SP3, I'm getting BSOD's with ever other boot. The machine really isn't suited to XP but I need it for some legacy applications. I might consider moving to Windows 7 32-bit though. – series0ne Feb 26 '13 at 12:44

Look up the Hardware ids on the internet for the devices to see what they are. One good place is the PCI or just Google the strings.

enter image description here

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.