After setting
core.default_ps_max_latency_us=200
and running for a few hours, the system slows down significantly with 
intermittent long pauses.

As all of this is rendering my computer unusable for work, can somebody
advise how to restore an use a previous kernel (and which one)?

Thanks and much appreciated!

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https://bugs.launchpad.net/bugs/1903388

Title:
  Failure to write to NVMe disk soon after boot (APST-related)

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