** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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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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