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Windows 7: UMBus Root Bus Enumerator - Unknown Device

17 Aug 2015   #1
Natikabu

Windows 7 Professional 64bit
 
 
UMBus Root Bus Enumerator - Unknown Device

Hi there,

I tried to install a wireless Logitech keyboard/mouse combination. The keyboard works fine, the mouse doesn't. The device manager shows the "UMBus Root Bus Enumerator" as unknown device. I researched in some forums and found this: "sc config umbus start= demand". But it doesn't work.

In this forum I found an older threat with this post:
Go to Device Manager > Action > Add legacy hardware > Next > Install the hardware that I manually select from a list > Next > click on "System Devices" > Next > then under "Manufacturer" click on "Microsoft" then under "Model" click on "UMBus Root Bus Enumerator" > Next > Next

But when I want to install legacy hardware, the software asks for a storage device with the drivers. The installation DVD doesn't work. What to do?

Any help is appreciated.
Natikabu


My System SpecsSystem Spec
.
17 Aug 2015   #2
ComputerGeek

Desk 1: Win 7 Pro x32; Desk 2: Windows 10 x64
 
 

Check if these 3 files exist
  1. C:\Windows\inf\umbus.inf
  2. C:\Windows\inf\umbus.pnf
  3. C:\Windows\System32\drivers\umbus.sys
My System SpecsSystem Spec
18 Aug 2015   #3
Natikabu

Windows 7 Professional 64bit
 
 

Yes, these files exist in the correct folders.
My System SpecsSystem Spec
.

18 Aug 2015   #4
ComputerGeek

Desk 1: Win 7 Pro x32; Desk 2: Windows 10 x64
 
 

Look under System Devices. Is UMBus Enumerator listed? Missing? There with an error (yellow icon)

Reboot your machine. Navigate to folder C:\Windows\inf. You should find a file named either setupapi.dev or setupap.dev.log. In either case, zip it and upload to next post


Attached Thumbnails
UMBus Root Bus Enumerator - Unknown Device-umb.jpg  
My System SpecsSystem Spec
18 Aug 2015   #5
Natikabu

Windows 7 Professional 64bit
 
 

Yes, both devices are listed. Attached you find both files setup files.


Attached Files
File Type: zip Setup.zip (18.8 KB, 9 views)
My System SpecsSystem Spec
18 Aug 2015   #6
ComputerGeek

Desk 1: Win 7 Pro x32; Desk 2: Windows 10 x64
 
 

My guess is something corrupted registry key
Code:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DevicePath
DevicePath is a list of directories. When you install a driver, Windows inspects each directory in DevicePath looking for a suitable driver. DevicePath should ALWAYS include %systemroot%\inf. The log files you provided indicate it's missing from yours. (and that's the directory where umbus driver installation file resides)

Open the registry, look at the key above and show me a screen shot or copy/paste the value so I can see it. Check the key on your other machine too, the one that's working. Show me that one too

It's likely a 3rd party installer corrupted this registry key. Let's compare DevicePath as defined on both machines.

/* EDIT */
Oooops. Had you confused with someone else who had 2 machines. But all I said remains true for you. Show me DevicePath on your computer
My System SpecsSystem Spec
20 Aug 2015   #7
Natikabu

Windows 7 Professional 64bit
 
 

This is the content of DevicePath:
%SystemRoot%\inf;C:\Program Files\Samsung\USB Drivers\01_Simmental;C:\Program Files\Samsung\USB Drivers\02_Siberian;C:\Program Files\Samsung\USB Drivers\03_Swallowtail;C:\Program Files\Samsung\USB Drivers\04_semseyite;C:\Program Files\Samsung\USB Drivers\05_Sloan;C:\Program Files\Samsung\USB Drivers\06_Spencer;C:\Program Files\Samsung\USB Drivers\07_Schorl;C:\Program Files\Samsung\USB Drivers\08_EMPChipset;C:\Program Files\Samsung\USB Drivers\09_Hsp;C:\Program Files\Samsung\USB Drivers\11_HSP_Plus_Default;C:\Program Files\Samsung\USB Drivers\16_Shrewsbury;C:\Program Files\Samsung\USB Drivers\17_EMP_Chipset2;C:\Program Files\Samsung\USB Drivers\18_Zinia_Serial_Driver;C:\Program Files\Samsung\USB Drivers\19_VIA_driver;C:\Program Files\Samsung\USB Drivers\20_NXP_Driver;C:\Program Files\Samsung\USB Drivers\21_Searsburg;C:\Program Files\Samsung\USB Drivers\22_WiBro_WiMAX;C:\Program Files\Samsung\USB Drivers\24_flashusbdriver;C:\Program Files\Samsung\USB Drivers\25_escape

I deleted everything except the "%SystemRoot%\inf" and rebooted the system, but nothing changed. I remember, that the problem began after some software installation, but I don't remember what it was.
My System SpecsSystem Spec
20 Aug 2015   #8
Natikabu

Windows 7 Professional 64bit
 
 

Now the problem ist solved. I tried again the Update Driver option in the Device Manager and manually set the path to Windows/inf. The driver was updated and everything works fine. All new USB devices are found now.

Thanks a lot for your support. It helped me to understand the structures of Windows a bit deeper.
My System SpecsSystem Spec
20 Aug 2015   #9
ComputerGeek

Desk 1: Win 7 Pro x32; Desk 2: Windows 10 x64
 
 

Hi Natikabu

You're most welcome. Glad i was able to help. (And thanks for the rep!)

I'm glad you got it to work but one last thing puzzles me: Your data indicates %systemroot%\inf is, in fact, in DevicePath

So, please verify this: Open File Explorer, type %systemroot% as the file path, hit Enter.
  • If Explorer takes you to folder C:\Windows, %systemroot% is OK and i guess this is just another Windows mystery!
  • But if you're NOT taken to C:\Windows, then the value of systemroot is corrupt and need be fixed
My System SpecsSystem Spec
21 Aug 2015   #10
Natikabu

Windows 7 Professional 64bit
 
 

Good morning ComputerGeek,

%systemroot% takes me to C:\Windows as it should. It seems we're indeed tapping around in the mysterious realms of Microsoft.

Thanks again and all the best
Natikabu
My System SpecsSystem Spec
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