ACPI SMO8800 driver missing for Dell E6410/E6420/E6510/E6520 – unknown device ACPI SMO8800 65

We received a bunch of new Dell E6420’s at work, and needed to get them prepped for drivers and our image deployment. We run a deployment process through Landesk OSD, with HII (Hardware Independent Imaging), which basically means that we have 1 image for multiple model computers.

I installed our basic Windows 7 Pro x32 image on the new machine, and was going through drivers that needed to be installed, and ran into one tricky one. In Device Manager, right-click the device and click Properties. Under the details tab, choose Hardware ID from the drop box. You’ll see something like ACPI\SMO8800 (that’s what the unknown device was on mine). Google that hardware ID and you’ll find that it’s an accelerometer, a device that detects when your laptop may be falling and instantly stops the hard disk so it isn’t damaged on impact.

I went through and extracted the drivers for it in Windows 7 x86/x64, Vista x86/x64, and XP x86/x64. The zip file is 2.79 MB (2,926,227 bytes). You can download the drivers here : LINK IS DEAD

All you have to do is extract it (I use 7zip), and navigate your update drivers to your respective OS version and x86/x64 version. If you want a more detailed write up on how to do it, with pictures, let me know.

Hopefully this helps :).


65 thoughts on “ACPI SMO8800 driver missing for Dell E6410/E6420/E6510/E6520 – unknown device ACPI SMO8800

  1. Reply Tariq Jun 2,2011 8:11 am

    Thanks for the solution it worked for me.

    By the way where did you download that .zip file from?

    Thanks once again.

  2. Reply Vivi The Mage Jun 2,2011 8:14 am

    I extracted it from a defaulted/preloaded Windows 7 Dell E6420. It worked much better that way, also didn’t need to install any software either.

  3. Reply Trey Jun 23,2011 8:36 am

    Thank you for this. Dell sure does make imaging these things a pain in the ass.

  4. Reply Vivi The Mage Jun 23,2011 8:44 am

    Agreed, I have to do this for ever model :s. Not sure what changed, but they seemed to have made it a bit more difficult.

  5. Reply Thomas Jun 28,2011 3:58 pm

    We received our first batch of Dell E6420’s at work as well. Installed Win7 ent from scratch and got the same “unknown device” under device manager.

    I just want to say thanks! it worked 🙂

  6. Reply Vivi The Mage Jun 28,2011 4:05 pm

    Glad to hear, what are you guys using for deployment? I am curious :).

  7. Reply Thomas Jun 28,2011 5:20 pm

    Landesk 9x SP2 using standard OSD. We’re still having some trouble with HII. Can’t really play with it due to my boss wants me to focus on HIPS and daily tickets. We’re just a small shop that gets hit by viruses and malware daily. We’re also running McAfee EPO, but I seem to have lost trust in them. lol

  8. Reply Vivi The Mage Jun 28,2011 9:02 pm

    Same set up here :). Landesk with HII, works gorgeously now that I have it tweaked. What issues with HII are you having? I’ve found their support to be very useful. We also use mcafee…our real winner against virus/maleware is websense though.

  9. Reply Vivi The Mage Jul 6,2011 2:51 pm

    That link does not work.

  10. Reply Thomas Jul 11,2011 10:07 am

    Hi Vivi,

    Sorry it took me forever to reply back. Found out that my contract with my client is ending soon, so I kinda went into panic mode, currently looking for a job.

    We’re still having HII issues with AHCI and ATA SATA type drives, I’m sure their in-house techs can figure that out. That’s the last thing I’m worried about right now. 🙁

  11. Reply Vivi The Mage Jul 11,2011 10:10 am

    No problem. The thing we do is, change everything to ATA to make it standards. AHCI isn’t really needed for us at least, running a XP/7 environment sitll.

  12. Reply Thomas Jul 13,2011 11:22 am

    Sweet! I’ll keep that in mind. Thanks, Vivi!

  13. Reply Vivi The Mage Jul 22,2011 10:58 am

    Yup, but you have to dig around for the correct driver.

  14. Reply Pankaj Jain Sep 4,2011 3:45 pm

    Thanks, worked for me as well on Dell E6320. Cheers

  15. Reply Vivi The Mage Sep 4,2011 4:32 pm

    Great, I am glad it helped someone else!

  16. Reply Dude Sep 8,2011 6:10 am

    Yeah – thanks for that!

  17. Reply Armin Sep 8,2011 1:24 pm

    I was not aware that my laptop have an free fall protection, cool!

  18. Reply Vivi The Mage Sep 8,2011 1:39 pm

    I am not sure how well it works, ha! Most of them are built into the drives themselves, and BIOS handles it I thought.

  19. Reply Gish Jan 3,2012 10:10 pm

    Looks good. Thanks

  20. Reply ndog Jan 23,2012 3:59 am

    Thanks for sharing this. We use universal wim file images for win xp and win 7 flavours, so this has made life a little easier. Dells are always fun when it comes to drivers, however if you hunt hard enough you almost eventually get them all.

  21. Reply Vivi The Mage Jan 23,2012 8:26 am

    Exactly, and someone has to post them!

  22. Reply Jamie Gilbert Jan 24,2012 3:04 am

    Thank you so very much for posting this solution online. I have spent the best part of two days trying to get this driver installed on my Windows 7 64bit image. Dell list only a handful of drivers on their site for Win7 64bit and this wasn’t one of them.

  23. Reply Vivi The Mage Jan 24,2012 9:08 am

    You’re welcome! Glad it helped, took me a few hours, enough to make it worthwhile in posting.

  24. Reply Ghost Dog Apr 5,2012 8:21 am


    That did the trick, the driver was driving me mad!!!!

  25. Reply Vivi The Mage Apr 5,2012 8:24 am

    Tell me about it! Glad I could help.

  26. Reply sanjeeeb May 31,2012 8:47 pm

    hi problem of this hardware

  27. Reply Vivi The Mage May 31,2012 10:19 pm

    What is the problem? I’ll see if I can help.

  28. Reply Aden Jun 27,2012 4:03 pm

    Thanks mate, worked fine for me! 😀 (DELL XPS L701X)

  29. Reply dubz Jul 2,2012 9:04 am

    thanks, it worked!

  30. Reply TurboFool Aug 14,2012 4:44 pm

    Many thanks. This has been bugging me for a while in my Windows 8 test runs, but I never got around to resolving it because I knew it wasn’t vital to the system running. Finally on RTM now and decided to clear it up, and your page was the first to give me something concrete.

  31. Reply phil Aug 21,2012 11:56 pm

    Nice one, this fixed my Unknown device issues 🙂

  32. Reply Ethan Sep 5,2012 1:06 am

    If you’d like to download the driver from the Dell website, navigate to, select your make/model/OS of laptop and then look in the “Application” group of files. The unknown device is the ST Microelectronics Driver – It’s the freefall sensor!

    Frustrating that the drivers are not better labeled but then again too bad there isn’t a Staples Easy Button for everything either.

  33. Reply Vivi The Mage Sep 5,2012 8:16 am

    drivers have always been the funkiness to PC’s, some of them take some effort to figure out :S.

  34. Reply asmil Sep 25,2012 7:42 pm

    ACPI SMO8800 driver missing
    Ethan on September 5, 2012 at 1:06 am said:

    If you’d like to download the driver from the Dell website, navigate to, select your make/model/OS of laptop and then look in the “Application” group of files. The unknown device is the ST Microelectronics Driver – It’s the freefall sensor!

    …navigate to, select your make/model/OS of laptop and then look in the “System Utilities” group of files. The unknown device is the ST Microelectronics Driver…for accelerometer…

    My laptops : XPS L502x & L702x .

  35. Reply Alija Oct 15,2012 1:47 am

    Thank you! This helpd me alot.

  36. Reply Marc Nov 10,2012 2:58 pm

    Thanks! Worked like a charm

  37. Reply EMAD SAWEER Nov 10,2012 3:47 pm

    Thank you! This helpd me alot

  38. Reply Jordan Nov 13,2012 12:40 am

    So I downloaded your zip file. Found the necessary driver in it (Win7 x64) and then found out it’s all registry codes? or whatever… I don’t really know anything about the internal workings of my computer. Is there a place I need to copy-paste these files? Or do I just double-click one of the files within the folder and my comp. will take care of the rest?
    Thanks in advance and thanks for already finding a solution to the problem for me XD

  39. Reply Vivi The Mage Nov 13,2012 8:14 am

    You can just put them on your desktop, or wherever and then run the update driver on the one that has the exclamation point next to it and point it to this directory to pull drivers from.

  40. Reply Jordan Nov 13,2012 5:47 pm

    Ah! Thanks so much Vivi!

  41. Reply medman Nov 25,2012 8:48 am

    kindly help me wit the following hardware ids for my dell vostro 3555.or the site to the dowload the following .ACPI /SMO8800 and USB/VID_138A&_0011&REV_0078.waiting for kindly reply thanks .


  42. Reply Vivi The Mage Nov 25,2012 12:06 pm

    Have you tried plugging in the free fall sensor driver?

  43. Reply Sjaak Dec 16,2012 2:05 pm

    Thanx for your article, it helped me to figure out what driver i was missing!

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