I have been googling and I feel this answer should be a simple one. I think that the keywords are however, too generic and are bringing up a lot of things related but not what I am looking for.

I am kernel debugging in Windbg connected to a VM in VMware. I am loading a driver and I noticed that I cannot view DbgPrint messages.

So far from Googling, I can see that I should have a value in this registry to change

HKLM\SYSTEM\CCS\Control\Session Manager\Debug Print Filter

I don't see however, a value for Debug Print.

I understand this was turned off for noise purposes. Is there a simple way to turn it on, even if temporary?

2 Answers 2


The simple way to turn on the debug information is to modify the mask directly in WinDBG with this command :

kd> ed nt!Kd_Default_Mask 8

The console will become massively verbose...

  • 1
    Hi, perhaps do you know if there's any way to filter the logs for specific processes ? Thanks
    – Zohar81
    Commented May 2, 2019 at 7:50
  • @Zohar81 only turn it on when you hit a breakpoint and then turn it off at another breakpoint Commented Apr 16, 2021 at 0:32

As per Reading and Filtering Debugging Messages:

On the target computer, you can access the component filter mask in the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Debug Print Filter. Using a registry editor, create or open this key. Under this key, create a value with the name of the desired component, in uppercase letters (for example, DEFAULT or IHVDRIVER). Set this value equal to the DWORD value that you want to use as the component filter mask (for example, 0x8 to display DPFLTR_INFO_LEVEL messages, in addition to DPFLTR_ERROR_LEVEL, or set the mask to 0xF to display all messages)

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