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Atephious
1 Copper

XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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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.

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Philip_Yip
5 Iridium

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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From the hardware IDs that is the free fall sensor:

The Windows 8.1 Driver is here: http://downloads-us.dell.com/FOLDER01687839M/2/FreeFallSensor_ST%20Microelectronics_W814_A00_setup-F...

The Windows 8.0 Driver is here: http://downloads-us.dell.com/FOLDER00951951M/6/FFS_ST_W78_A00_Setup-KT7XG_ZPE.exe

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads


#IDoNotWorkFor Dell
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7 Replies
ieee488
5 Rhenium

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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You can try to run Diagnostics first to check if there is a hardware failure to your computer

Steps

1.Turn off your Laptop

2. Turn it back on but as soon as you press the power button keep tapping or hitting F12  you will see  a black screen saying advanced boot option

5. Choose the option that says " Diagnostics"

That will check if you have hardware failure or not it will provide error code , once it does

Post the error code here

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Philip_Yip
5 Iridium

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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From the hardware IDs that is the free fall sensor:

The Windows 8.1 Driver is here: http://downloads-us.dell.com/FOLDER01687839M/2/FreeFallSensor_ST%20Microelectronics_W814_A00_setup-F...

The Windows 8.0 Driver is here: http://downloads-us.dell.com/FOLDER00951951M/6/FFS_ST_W78_A00_Setup-KT7XG_ZPE.exe

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads


#IDoNotWorkFor Dell
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vance03
1 Copper

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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Wow! 2 out of 2 problems fixed.  this has got to be the best experience I'v ever had with Dell community.  You are the bomb....Thanks and btw. The link: http://downloads-us.dell.com/FOLDER01687839M/2/FreeFallSensor_ST%20Microelectronics_W814_A00_setup-F... worked and updated it.  Thanks

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bylmy
1 Copper

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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Very Thanks. It is fix my unknown device issue!

InsekC
1 Copper

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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I have the same problem with Windows10 64bit on my XPS15Z. I tried to instal the driver for Win 8.1 but I got answer "unsupported op system".

The other problem is that after instslling Win10 the EJECT CD key stopped to work.

InsekC

forlitke
1 Nickel

RE: XPS 15Z Windows 8 Unknown Device located on PCI Express Root Complex

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Thank you for your sharing your insights.   I recently had to reinstall W10 on my Alienware18r3 and discovered the same missing drivers -  1) ACPI and 2) PCI Express Drivers -   will the W8.1 driver mentioned in this thread work on Win10?   Currently Windows can not update the driver and this situation also occurred when upgrading from W8 to W10 and I was unable to fix the situation until MS released a major OS update to W10 -  Question again -  can I use the FreefallSenor driver for W8.1 on W10?

thank you in advance.

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