Haw Loeung, thank you for reporting this and helping make Ubuntu better.
Intel has a nice high level on the definition of PCC, and how it would
relate here
https://firmware.intel.com/sites/default/files/resources/PCC%20White%20Paper_0.pdf
. With this in mind, given no tangible issues have been noted, the error
message is considered innocuous.
However, to further root cause, if you remove all the non-default kernel
parameters, is it still reproducible:
apparmor=0 elevator=noop intel_pstate=enable i915.enable_rc6=7
i915_enable_fbc=1 i915.lvds_downclock=1 drm.vblankoffdelay=0
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1532523
Title:
Error parsing PCC subspaces from PCCT on ThinkPad X1 Carbon (Type
20A7)
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