From the hardware IDs that is the free fall sensor: The Windows 8.1 Driver is here: [URL] The Windows 8.0 Driver is here: [URL]
Hi, I have a Dell XPS 15Z, which I bought off a friend. They recently updated to Windows 8 and so now thats what I have. But when i go into my drivers its telling me that i have an unknown driver. no solutions online have answered my questions though some came close. So, this is what i know: Unknown Device Device Type: Other devices Manufacturer: Unknown Location: on PCI Express Root Complex Hardware Ids: ACPI\VEN_SMO&DEV_8800 ACPI\SMO8800 *SMO8800  i don't know if this is related but my laptop also wont charge. I just bought a new AC Adapter to replace the one i had, and it still isn't charging. The light blinks red 4-5 times and blue/green once. ive searched online to see what the problem is but i cannot do some of the fixes as the computer is at 0% battery.  
XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex