The !ks.pciaudio extension displays a list of FDOs currently attached to PortCls.
!ks.pciaudio [Options] [Level]
Optional. Specifies the kind of information to be displayed. Options can be any combination of the following bits.
Bit 0 (0x1)
Display a list of running streams.
Bit 1 (0x2)
Display a list all streams.
Bit 3 (0x4)
Output displayed streams. Level has meaning only when this bit is set.
Optional, and applicable only if Bit 3 is set in Options. Levels are the same as those for !ks.dump.
Windows XP and later
For more information, see Kernel Streaming Debugging.
Here is an example of the output from !ks.pciaudio:
kd> !ks.pciaudio 1 Audio FDOs found: Functional Device 8299be18 [\Driver\smwdm]