This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-
bionic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1773295

Title:
  False positive ACPI _PRS error messages

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  New platforms have hardware registers for routing table implemented as
  "write once". Once set by UEFI firmware during POST, OS will not be
  able to modify the routing table, and ACPI _PRS method are removed
  according to ACPI spec.

  As a result, generating the error messages "ACPI Exception:
  AE_NOT_FOUND, Evaluating _PRS" in kernel by default does not make
  sense, and they should be muted by default.

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