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

[Eric_DL]

** Package changed: linux-lowlatency (Ubuntu) => pm-utils (Ubuntu)

** Description changed:

  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 whole translation are activated
+ 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
  usual.
  
  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 3.5.7.32
  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)

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https://bugs.launchpad.net/bugs/1319618

Title:
  pm-utils hook unable to restore previous CPU state when resuming from
  suspend

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