Sleep Issue with External Microphone

[abhi182]

I have a M1 MBA connected via the Apple Multiport Adapter to an external 4K monitor .
While the setup works great, it seems to have some issue with sleep.

If I leave the computer, it never seems to go to sleep on its own.
If I put it to sleep manually, the display wakes up with 10-15 seconds.
This occurs with both clamshell mode / with the internal display running

pmset log shows the following:
However, no user activity had occurred during this period
2021-01-11 13:32:08 +0530 Wake DarkWake to FullWake from Deep Idle [CDNVA] : due to UserActivity Assertion Using AC (Charge:100%) 625 secs 2021-01-11 13:42:33 +0530 Sleep Entering Sleep state due to 'Idle Sleep':TCPKeepAlive=active Using AC (Charge:100%) 3 secs 2021-01-11 13:42:38 +0530 Wake DarkWake to FullWake from Deep Idle [CDNVA] : due to UserActivity Assertion Using AC (Charge:100%) 316 secs 2021-01-11 13:47:54 +0530 Sleep Entering Sleep state due to 'Idle Sleep':TCPKeepAlive=active Using AC (Charge:100%) 5 secs 2021-01-11 13:48:01 +0530 Wake DarkWake to FullWake from Deep Idle [CDNVA] : due to UserActivity Assertion Using AC (Charge:100%) 408 secs 2021-01-11 13:54:49 +0530 Sleep Entering Sleep state due to 'Software Sleep pid=141':TCPKeepAlive=active Using AC (Charge:100%) 11 secs 2021-01-11 13:55:02 +0530 Wake DarkWake to FullWake from Deep Idle [CDNVA] : due to UserActivity Assertion Using AC (Charge:100%)


EDIT: So I tested by unplugging all devices incl monitor and then tested sequentially
The (surprising ) culprit is an external USB microphone ! (AKG Lyra)
I am still unsure how a mic can wake the mac from sleep