Dell Latitude E6510 unknown device ACPI SMO8800

New Dell Latitude owners may notice an unknown device in their device manager. Here’s how to find out what it is and the solution to what mine was.

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. Dell still uses these sensors on several models of their laptops. If enabled, they can be a big safeguard on lost data from dropped laptops.

For those with the specific ACPI\SMO8800 device, here’s a link to Dell’s driver for
the freefall sensor.

Additionally, you may find this unknown device identifier utility useful.

By |2016-12-11T08:57:38+00:00May 26th, 2010|drivers|34 Comments


  1. Carlos Lijeron December 16, 2011 at 12:15 pm - Reply

    Thanks for this tip. It worked after downloading the following drivers:

    ST Microelectronics-Driver

  2. DC September 15, 2011 at 3:29 pm - Reply

    That worked for me. Thanks for the info!

  3. Naz September 15, 2011 at 2:05 am - Reply

    Hi, it worked in my Vostro Notebook 3500 .

  4. dell 502lx September 14, 2011 at 12:50 pm - Reply

    worked great for my dell 502LX. thank you!!!!!!

  5. JEREMY July 6, 2011 at 11:07 am - Reply

    please for me

  6. Scott July 5, 2011 at 8:38 am - Reply

    Kudos for finding this !!! Worked great on my E6510. I actually remembering unsintalling it because I was cleaning this laptop for a new user and didn’t know what it was. Oops !! Thanks again.

  7. Gurumurthy June 26, 2011 at 6:49 pm - Reply

    thank you it will works to dell xps L501X

  8. Basti June 9, 2011 at 9:08 am - Reply

    Great, thanks! Worked on Latitude E6410 🙂

  9. Rich May 30, 2011 at 8:43 am - Reply

    Worked for a E6410 too + Nate’s comment a handy reminder. Many thanks

  10. Andy May 27, 2011 at 3:31 pm - Reply

    Thank you so much for such a smart solution! Nothing helped until I found your post. Great job!

  11. Nate May 25, 2011 at 8:23 am - Reply

    Additionally…i noticed the driver listed is a bit old. You can find the newest version of the free fall sensor driver at Dells website after putting in your service tag and going under the Applications tab. At the very bottom should be the latest version.

  12. Nate May 25, 2011 at 8:21 am - Reply

    worked on my E6510…thank you!

  13. Patrick April 13, 2011 at 5:07 pm - Reply

    Like Tim, I too google searched for the ACPI\SMO8800 and this is the first hit I got. Resolved my issue with my E6410. Thanks!

  14. Debi April 5, 2011 at 9:45 am - Reply

    Thank you! YOu just made my day easier. This worked on a Dell Lat E6410

  15. bob v April 2, 2011 at 11:23 pm - Reply

    Worked for a dell l502x

  16. David February 15, 2011 at 7:16 pm - Reply

    Thanks so much worked with Latitude 13. Also thanks for the suggested software unknowdevice been looking for something like that.

  17. Urij February 7, 2011 at 4:05 pm - Reply

    Thanks! It is work on Dell e6510

  18. bi January 26, 2011 at 8:27 am - Reply

    thank you so much, it works for studio 1557.

  19. Peter January 25, 2011 at 2:02 pm - Reply

    Worked for Dell Precision M4500. I spent hours scouring the internet and contacting Dell to no avail until I found this. Thank you so much for posting this…

  20. Michelle December 12, 2010 at 12:34 am - Reply

    Thank you so much!! This was the only problem I had left ..and it worked great for the XPS 15 I just bought when I upgraded the OS.

  21. kb December 10, 2010 at 10:21 am - Reply

    Thanks! You are a lifesaver and a timesaver! M4500 laptop

  22. Paulo November 10, 2010 at 7:53 am - Reply

    VERY NICCEEE !! =D works perfectly on E5410 for the unknown device ! really thankss xD =D

  23. vyncynt November 9, 2010 at 1:38 am - Reply

    got it working on latitude e6410 and e4310.


  24. rastamat October 31, 2010 at 3:11 pm - Reply

    “Thanks alot, it was indeed the freefall sensor (Dell M4500).”


  25. ditoh1 October 31, 2010 at 2:50 pm - Reply

    yeah man, this article rocks!!!

    Thanks dude!! (Latitude E6510)

  26. l8nytalumni October 16, 2010 at 3:12 pm - Reply

    thanks for the help! 🙂

  27. Greg October 15, 2010 at 7:44 am - Reply

    Thank you, I had this problem after reinstallin a Dell E6510 with 64bit Win7, it had come with 32bit installed and the instructions and driver setting from Dell didn’t help me with this “Unknown Device”. I did a search on acpi SMO8800 and found your post.


  28. DanoTheITGuy September 23, 2010 at 2:33 pm - Reply

    Dude!! Thanks!!!

  29. Howard Chou September 5, 2010 at 3:44 am - Reply

    It works. Thanks.

  30. The one August 19, 2010 at 2:35 pm - Reply


  31. Tim July 23, 2010 at 9:35 am - Reply

    Thanks for this. I did a google search for the ACPI\SMO8800 and this was the first site I found. It helped with the Latitude E6410 I was having problems with. Thanks again.

  32. rplow June 26, 2010 at 7:21 am - Reply

    That was the ticket. Thanks

  33. Bo June 21, 2010 at 8:09 am - Reply

    Thanks alot, it was indeed the freefall sensor (Dell M4500).

  34. Aaron June 3, 2010 at 11:49 pm - Reply

    worked great for studio 17 also its located on the cd. I just needed to know that this was the motion sensor…. gesh the hours I wasted

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