** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1528684
Title:
Error parsing PCC subspaces from PCCT
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Fix Committed
Bug description:
[Impact]
A scary-looking message appears in dmesg in several places during boot:
"Error parsing PCC subspaces from PCCT"
This could cause users to believe they have buggy firmware, in cases
where it's actually fine.
[Test Case]
dmesg | grep "Error parsing PCC subspaces"
[Fix]
Resolved in upstream commit that cleanly cherry-picks back to bionic:
8f8027c5f935 mailbox: PCC: erroneous error message when parsing ACPI PCCT
[Regression Risk]
PCC is a generic ACPI-defined mechanism for the OS and firmware to
communicate. Since the fix does change how the tables are parsed, regression
scenarios could include breakages in PCC clients (things that use this layer to
communicate to firmware). The only Kconfig option I see in bionic's source that
depends on CONFIG_PCC is the CPPC library, which provides ACPI CPU performance
management used by the cppc-cpufreq driver and is used by the scaling
driver/governor for Sandy bridge processors.
Tested on an Nvidia DGX system. This is an upstream fix, so any
regressions will have upstream support.
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