I've been running into very puzzling behavior with HLK Controller / Studio
8109. I have an APO attached to an Inbox USB driver that is failing the
"Audio Codec - Class Driver Audio Logo Test - Certification - Desktop".
We are seeing very strange behavior. On our HLK Client RS5 machine (clean
install) the installed USB device + APO sounds fine before running any
tests. As soon as I run a test (the one above) the audio is very very
glitchy, and it never recovers...even after the test completes. From that
point on, any USB audio device that is plugged in exhibits the same glitchy
audio. From the Task Manager I can see that the "Windows Device Isolation
Graph" process is spiking to 10 to 20% CPU utilization, and it is normally
under 2%. I've even bypassed any processing in the APO to make sure there
wasn't any infinite loops etc. It seems like there has been some
instrumentation of the audiodg.exe process that is drastically affecting
performance. I'm seeing this on 3 different machines and am now running
out of ideas.
Has anyone run into this issue or have any suggestions? Thanks in advance.
BTW, this same APO passed all tests about 6 months ago, so I'm thinking it
has to be some configuration issue.