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Have you installed Inte MEI driver?<br><br>
EDIT: Asus software is not required for any device. Its just monitoring tools!
 

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You should get an automated windows update for that to go away, however I personally didn't want it so I disabled it in device manager.
 

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If you really want to "fix it" then you can always install AI SUITE. I have it disabled as I mentioned but if I enable it, I'll get a Windows update (but I have Win8.1 so maybe that's a difference).<br><br><a class="H-lightbox-open" href="http://www.overclock.net/content/type/61/id/1810822/"><img alt="" class="lightbox-enabled" data-id="1810822" data-type="61" src="http://www.overclock.net/content/type/61/id/1810822/width/500/height/1000/flags/LL" style="; width: 500px; height: 363px"></a>
 

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I am not 100% sure, but I think you need this;<br><br>
“ATK0110 ACPI Utility” driver, to fix the unknown device. It should be on your CD that came with motherboard. Or you should be able to down load from the internet.<br><br>
Hope this helps. It worked for me on my ASUS Maximus VI Formula.<img alt="smile.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/smile.gif">
 

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Install the CD that came with the motherboard. You don't need to install any drivers.
 

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As Chaos said, you need to install the Intel MEI (Management Engine interface) driver. Contrary to popular belief, the MEI driver is vital for your chipset to communicate with your hardware. Go to Asus site for your board and get the latest MEI driver for your OS.<br>
Also as others have said, you don't need ANY of the Asus Utilities on the disc for your board, in fact you don't need the disc for anything.
 

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It's not MEI.<br><br>
Downloading this from the ASUS site will likely fix it, the CD will likely have it but it's an older version. This will give him a "AMDA00 Interface" under the system devices section.<br><br>
ASUS_AMDA00_ACPI for Windows 7 32/64bit & Windows 8 32/64bit & Windows 8.1 32/64bit.
 

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I have the new Asus Z97 Sabertooth board and found that the ACPI\PNP0A0A is in fact the AMDA00 which in turn is commonly known as the Asus probe sense thermal driver. <img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif">
 

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+1 for Halloran's post (#12) just one above this. His suggestion worked perfectly for me with an Asus Z97 Pro and a lingering "unknown device". (Re)Installing the Intel Management Engine did NOT work.<br><br>
I'll type a longer story, in case some of the keywords lead more people to Halloran's post. I called Asus (812-282-2787) blindly about an "unknown device" under "other devices", hoping that they could provide a quick fix. I've heard great things about Asus from friends in IT... hopefully it extends to their reliability because the tech support was NOT good. After googling several device properties, I googled the "Hardware Ids" value of "ACPI\PNP0a0a". That brought me here, and after the Intel Management Engine driver didn't work I kept reading until Halloran's post that suggested the probe sense thermal driver. I brought up my mobo model on Asus' website (<a href="http://www.asus.com/us/Motherboards/Z97PRO/HelpDesk_Download/" target="_blank">http://www.asus.com/us/Motherboards/Z97PRO/HelpDesk_Download/</a>) and downloaded the "ASUS Probe II Sense Driver" for win 7 x64. The "unknown device" moved from other devices into system devices. I restarted, and the unknown device turned into ACPI Thermal Zone. Problem solved, I think. Thanks again Halloran, and overclock.net.<br><br>
Click the spoiler here for my tech support debacle.
<a class="spoiler-link H-spoiler-toggle" href="#"><strong>Warning: Spoiler!</strong> <span class="spoiler-help">(Click to show)</span></a><div class="spoiler-hidden">The tech was quite polite, just couldn't understand bland american english - and I couldn't understand her either. Once she understood I saw the unknown device in the device manager, she wanted to know if it was my router's device manager. I told her I didn't own an Asus router, which really confused her. She put me on hold to go ask if I called the right department. PARAPHRASE: Let me ask my manager if I'm the right person to help with motherboards. Apparently, the manager said yes.<br><br>
I still say no.<br><br>
After we both agreed that I hit "2" for motherboards, not routers, she correctly asked if everything I had plugged into the mobo was listed in the device manager. Yes. Okay, she says she has to research the problem further... she asks me for three things from the device's properties: Error code (28), Device Type (Other devices), and Manufacturer (unknown). Well, I'm no computer elite, but code 28, other, and unknown can describe way too many problems. So I asked her again, "Are you SURE that is all the information you need? I can give you more, I just don't know what you need to trouble shoot". Nope, that's it, she'll call me in 1-2 hours. That's when I started googling the properties off the details tab.. led me here, problem solved. So I call Asus again and asked to speak to her, just to let her know I found the problem, and to suggest that she recommend to her manager that they add the solution to her script. I get Jeffrey, much easier to understand... he has no clue who she is when I mention her name and other similar-sounding names, and there is nothing entered into the system under my serial number, phone number, or name. Really? Asus needs to trim their tech support staff. At least Jeffrey had the presence of mind to start a support ticket and close it. Problem solved.</div>
 

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+1 fot Halloran 's post and for Yimboli's post<br>
my problem is solved the unknown device of my Z97-K motherboard was an "ASUS Probe II Sense Driver" for win 7 x64 and found the driver at<br>
(<a href="http://www.asus.com/us/Motherboards/Z97K/HelpDesk_Download/" target="_blank">http://www.asus.com/us/Motherboards/Z97K/HelpDesk_Download/</a>).<br>
Thanks<br><br><br>
pour les francais,<br>
le driver ACPI inconnu pour les cartes meres Asus Z97 est enfait le driver de la sonde thermique et peut etre telechargé sur <a href="http://www.asus.com/us/Motherboards/Z97K/HelpDesk_Download/" target="_blank">http://www.asus.com/us/Motherboards/Z97K/HelpDesk_Download/</a> en choississant dans le menu le driver correspodant à la sonde "ASUS Probe II Sense Driver"<br>
Merci à Halloran et à Yimboli pour leur aide précieuse.
 

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Well, thank you all, as well but does anyone know where does this driver help, besides correcting the "Unknown Device" problem, if you actually do not have the AI Suite installed?<br><br>
I mean, if you do not have the AI Suite installed is it imperative to install this ASUS Probe II Sense Driver? Will something malfunction if you won't install it? And how about programs like HWiNFO64, does this affect those?<br><br><span style="text-decoration:underline;">EDIT:</span><br><br>
I found the answer, if interested <a class="bbcode_url" href="http://www.overclock.net/t/1487530/asus-z97-republic-of-gamers-motherboard-owners-club/960_80#post_23300892">read this post</a>.
 

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Thanks! It works on my Asus Z87-PLUS too! <img alt="biggrin.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/biggrin.gif"> (y)
 

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The Asus Probe 11 Sense Driver fixed it for me.<br>
This was on an Asus Z79-Z<br><br>
I've had this before and didn't identify it.<br><br>
But had found if I selected update driver whilst in device manager.<br>
And just selected to search Asus DVD, it found the needed driver.<br>
But today I didn't have the original Asus driver disk.<br><img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif">
 

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After trying the tips here and several other message boards, I found one which did fix the issue for me.<br><br>
<a href="https://rog.asus.com/forum/showthread.php?70778-AMDA00-Fix-for-x99-boards-Unknown-Device-ACPI-PNP0A0A" target="_blank">https://rog.asus.com/forum/showthread.php?70778-AMDA00-Fix-for-x99-boards-Unknown-Device-ACPI-PNP0A0A</a><br><br>
I think the issue is more of a bug with the Asus AMDA00-ACPI installer. It does create the correct folder under C:\Program Files\ASUS\AMDA\AXSP, and the AtekComSvc.exe file is generated/copied there. The issue seams to be with the installer not creating the dll (PEbiosinterface32.dll) or not successfully lining it to the hardware. Basically, go to the AMDA\AXSP folder, run the AtekComSvc.exe, delete the unknown device in the System Devices folder (in Device Manager) and reboot.<img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif">
 
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