Lenovo P51 ALC298 same problem. Poping sound and quite annoying one.
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https://bugs.launchpad.net/bugs/1862791
Title:
ALC3234 - Popping sounds at the start and at the end of playback
I can confirm the issue on 16.04.4 LTS. And I am not switching any
sessions.
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https://bugs.launchpad.net/bugs/1733557
Title:
Login screen showing Authentication Failure Switch to