[wdmaudiodev] Unwanted FriendlyName uniquifying number prefix for USB PortCls MIDI miniport

  • From: Andrew Vogan <andrewvog@xxxxxxxxx>
  • To: wdmaudiodev <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Thu, 16 Jul 2015 13:10:02 -0400

My client wants to override the friendly MIDI device name specified in the
INF and follow a scheme like the following when multiple identical devices
are connected...

"My Device"
"My Device (2)"
"My Device (3)"

... and so on. However, the audio stack is inserting a uniquifying prefix
of "2- " onto the device name. Where does that come from, and is there a
way to override it?

I can already change the FriendlyName successfully
via IoOpenDeviceInterfaceRegistryKey following IoGetDeviceInterfaces with
the PDO. This sends me to the following registry location, at least on


Value name "FriendlyName" of type: REG_SZ

When I change the FriendlyName value, I can successfully see the new name
as I enumerate MIDI devices, however I also still see the unwanted, and in
my opinion, no longer necessary prefix of "2- ", so I end up with a device
name of "2- My Device (2)" and so on. Ideas?


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