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[Bug 1319618] [NEW] pm-utils hook unable to restore previous CPU state when resuming from suspend


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Distro : Ubuntu Studio 12.10 (low latency kernel)
M/B : Tyan Thunder S2915 (not S2915-E)
CPU : AMD Opteron Dual-core 2212 (frequency steps from 1 to 2GHz)
BIOS version : v3.0 (last version for this M/B)
BIOS config : NUMA + IOMMU + Memory hole translation are activated
Kernel boot options : /boot/vmlinuz-3.5.0-49-lowlatency root=UUID=xxxxxxxxx ro quiet splash acpi_os_name=linux acpi=strict pcie_aspm=off iommu=noagp

Issue Description :
CPU frequency looks normal after cold boot (slows down to 1GHz when CPUs are idle), but then stick to maximum frequency (2GHz) whatever CPU's load, since after resuming from first suspend to ram.
Behavior stays the same from this point on.

I didn't noticed it at first, until I took a look to my temperature
sensors a few days after the update, and saw my CPUs 15C hotter than

Behavior has started with kernel update from 3.5.0-48 to 3.5.0-49 (issue
doesn't occur when booting back on 3.5.0-48).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-49-lowlatency 3.5.0-49.50
ProcVersionSignature: Ubuntu 3.5.0-49.50-lowlatency
Uname: Linux 3.5.0-49-lowlatency x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu13
Architecture: amd64
Date: Thu May 15 03:40:49 2014
InstallationDate: Installed on 2013-05-26 (353 days ago)
InstallationMedia: Ubuntu-Studio 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: linux-lowlatency
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

** Tags: amd64 apport-bug kernel-power pm-utils powernow-k8 quantal
pm-utils hook unable to restore previous CPU state when resuming from suspend
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