I have tried kernel 5.15.0-68.75 in jammy on a Precision 5720 AIO and I no longer see messages that it "Could not resolve symbol [\_PR.CPU*._CPC]". In that sense, this fix partially addresses https://bugzilla.kernel.org/show_bug.cgi?id=213023. However, acpi_cppc support still appears to be absent as 'cppc' is not listed in /proc/cpuinfo and /sys/devices/system/cpu/cpu*/acpi_cppc/ is missing. This remains a regression compared to the earlier kernel 5.4 and the later 5.19.
** Bug watch added: Linux Kernel Bug Tracker #213023 https://bugzilla.kernel.org/show_bug.cgi?id=213023 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2006077 Title: Fix the ACPI _CPC not found error from kernel dmesg on some dynamic SSDT table loaded firmwares Status in linux package in Ubuntu: Invalid Status in linux source package in Jammy: Fix Committed Bug description: [Impact] Some machines which have dynamically loaded SSDT tables, will not be loaded and get the CPPC not worked. [Fix] Fix the regression by some load supports for CPPC from an SSDT dynamically when _OSC reports CPPC v2. And make the "[\_SB.PR00._CPC], AE_NOT_FOUND" gone. [Test] Verified all the OEM dynamic table loaded or the "[\_SB.PR00._CPC], AE_NOT_FOUND" error exist or not on demesg . [Where problems could occur] Low risk, It only helps to CPPC support loaded. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2006077/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
