Can reach PC3 only when storage in VMD (RAID ON) mode

[Kai-Chuan Hsieh]

Set the storage to VMD (RAID ON) in BIOS, the cstate be PC3 only.

Check /sys/kernel/debug/pmc_core/package_cstate_show by
# watch -n 2 cat /sys/kernel/debug/pmc_core/package_cstate_show

root@ubuntu-Precision-3571:/home/ubuntu# cat /sys/kernel/debug/pmc_core/package_cstate_show
Package C2 : 75232020
Package C3 : 20028303
Package C6 : 0
Package C7 : 0
Package C8 : 0
Package C9 : 0
Package C10 : 0

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-25-generic 5.15.0-25.25
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu80
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1100 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 11 14:36:46 2022
InstallationDate: Installed on 2022-03-29 (12 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
MachineType: Dell Inc. Precision 3571
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-25-generic root=UUID=d8676815-7d4e-4d79-8ba8-66c3cfae6575 ro intel_iommu=on quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.15.0-25-generic N/A
 linux-backports-modules-5.15.0-25-generic N/A
 linux-firmware 20220329.git681281e4-0ubuntu1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/25/2022
dmi.bios.release: 1.1
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.2
dmi.board.name: 0PY010
dmi.board.vendor: Dell Inc.
dmi.board.version: D00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.1.2:bd02/25/2022:br1.1:svnDellInc.:pnPrecision3571:pvr:rvnDellInc.:rn0PY010:rvrD00:cvnDellInc.:ct10:cvr:sku0B10:
dmi.product.family: Precision
dmi.product.name: Precision 3571
dmi.product.sku: 0B10
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[You-Sheng Yang (vicamo)]

The original fix was landed to oem-5.13/oem-5.14/impish in https://bugs.launchpad.net/bugs/1942160. Unstable was also nominated, but never accepted. Resuming the process.

[You-Sheng Yang (vicamo)]

Testing https://<email address hidden>/ in https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1968525 for 5.15-generic, unstable-5.17, oem-5.17.