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erikat
Blue Screen Again
Posts: 4
Registered: ‎08-29-2014
Location: Los Angeles, CA
Views: 46,555
Message 1 of 2

Unknown device in device manager after win8.1 upgrade W540

I'm using the W540 with an ultradock and external monitors. After upgrading my W540 to win8.1 64 bit, device manager is showing an unknown device. I'm not quite sure what it is, but almost everything seems to be working fine and Lenovo solution center isn't finding any driver updates.

 

I did notice that the solution center hardware scan did not test the video card memory and listed that test as N/A. Video and monitors seem to be working fine though and both nvidia and intel graphics show up in device manager.

 

Device manager lists the device in question as follows:

Device instance path: ROOT\SYSTEM\0001

Hardware Ids: root\iwdbus

Device stack: \Driver\PnPManager

 

erikat
Blue Screen Again
Posts: 4
Registered: ‎08-29-2014
Location: Los Angeles, CA
Views: 46,545
Message 2 of 2

Re: Unknown device in device manager after win8.1 upgrade W540

This seems to fix the problem.. any idea why?

 

http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W530-unknown-device-after-installing-windows-8...

 

(In device manager - Right click, uninstall, scan for hardware changes)

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