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Blue Screen Again
Posts: 1
Registered: ‎05-04-2011
Location: Philippines
Message 1 of 3 (2,551 Views)

Unknown Base System Device



I would just like to know how i can determine the driver for the unknown base system devices with the following locations:


PCI bus 2, device 0, function 4

PCI bus 2, device 0, function 0

PCI bus 2, device 0, function 3

Retired Moderator
Posts: 3,220
Registered: ‎07-31-2008
Location: Pakistan
Message 2 of 3 (2,476 Views)

Re: Unknown Base System Device

Hi and welcome to the forum!

What is 7 character product number of your ThinkPad? It looks like 2668-KHU and can be found on the back sticker.

Base system device is usually card reader.

Keep us informed though.


Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]

IdeaPad: U350

Apple:- Macbook Air [Snow Leopard]
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What's DOS?
Posts: 1
Registered: ‎04-27-2013
Location: Stockholm, Sweden
Message 3 of 3 (2,113 Views)

Re: Unknown Base System Device

I have a similar problem on my new lenovo x230 (type 2325-78G) 

The audio is not working, neither in (microphone) nor out loudspeaker or external phones that I connected..

The troubleshooter says that there is no driver installed for Base System Device, I found it in the Device Manager and under Properties I find  

"PCI bus 2, device 0, function 0

The drivers for this device are not installed. (Code 28)

There is no driver selected for the device information set or element.

To find a driver for this device, click Update Driver"


I did this but it comes back and says that Windows cannot find any driver.

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