Q. Hello, I have a Dell laptop and I just reinstalled Windows 7 Ultimate x64 on it. Now I have an unknown device ‘ACPI\SMO8800’ in device manager. What driver can I download to fix it?

A. Here are the download links for the driver that should solve your ACPI\SMO8800 Unknown Device issue:

[download id=”10460″ format=”1″], Dell dl link

NOTE: The driver is for your Dell laptop’s ST Microelectronics Free Fall Sensor (accelerometer), it is what shows up as Unknown Device ACPI\SMO8800 🙂

More details about free fall sensors:

That free-fall sensor is an accelerometer which can detect movement (i.e. downward acceleration or falling) and using that sensor your laptop can take steps to protect itself by parking the hard drive heads or other measure. IBM pioneered this technology in their ThinkPad line way back in 2003 and Dell has implemented it as well. Of course, it has applications beyond protection as even the Apple iPad/iPad 2/iPhones have an accelerometer which developers can use for games and other purposes! PS I would like to thank you for your question, as I am a big fan of the Latitude E series (and also the Dell Precision line). You have a nice laptop!

Device manager properties page after the correct driver has been installed:

Dell Laptops/Notebooks that use ACPI\SMO8800

Latitude E4310 Latitude E5410 Latitude E5420 Latitude E5420m Latitude E5510 Latitude E5520 Latitude E5520m Latitude E6220 Latitude E6320 Latitude E6410 Latitude E6410 ATG Latitude E6420 Latitude E6420 ATG Latitude E6420 XFR Latitude E6510 Latitude E6520 Latitude XT3 Dell Precision M4500 Dell Precision M4600 Dell Precision M6600 Dell Vostro 3500 Dell Vostro 3300(and others with Hardware ID ACPI\SMO8800)

Supported Operating systems:

Microsoft Windows 7 32-bit (x86) Microsoft Windows 7 64-bit (x64) Microsoft Windows Vista 32-bit (x86) Microsoft Windows Vista 64-bit (x64) Microsoft Windows XP (x86) Microsoft Windows XP x64

More info on this topic:


IBM Research | People | Mark A. Smith | APS

IBM Research | People | Mark A. Smith | APS of these systems use accelerometers placed on the motherboard to detect motion. A kernel software driver interfaces with the accelerometer and exposes its acceleration…
Accelerometer - Wikipedia, the free encyclopedia

Accelerometer – Wikipedia, the free encyclopedia accelerometer is a device that measures proper acceleration. This is not necessarily the same as the coordinate acceleration (change of velocity of the device in space), but…
Free-fall sensor – Wikipedia, the free encyclopedia page was last modified on 3 January 2011 at 13:52. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. See Terms of use…
10 Creative Ways to Use the Accelerometer [iPhone] | CreativeApplications.Net

10 Creative Ways to Use the Accelerometer [iPhone] | CreativeApplications.Net iPhone’s built-in accelerometer has created a world of opportunities for developers to create applications that are engaging, creative, innovative and fun. Here we…

Code 28 on PCI bus Driver functionality rated 5/5 stars (no problems and simple install)


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