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[FRnunurs <1260112@xxxxxxxxxxxxxxxxxx>]

@penalvch :

I got the same profesionnal DELL laptop and the same issue with Precise.
On AC or battery, cur_freq is sticked to 800000. I tried to remove cpufreq tools, but nothing changed.

The strange part is when I plug my laptop on my Dell dock at the office,
power strategies are working absolutely well ... As soon as it runs
undocked, cpu is working at its lowest speed step even when i've not
suspended the system once.

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https://bugs.launchpad.net/bugs/1260112

Title:
  [Dell Latitude E6540] CPU stuck on minimum frequency after resume from
  suspend and unplugged

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This happens on a Dell Latitude E6540 (4th gen core i7 CPU).

  Steps to reproduce:

  1) normally boot the computer and make sure  everything works as expected (i use the ondemand governor)
  2) suspend
  3) make the computer is unplugged and resume

  Expected behavior: cpu should work normally
  Actual behavior: cpu always stays at minimum frequency (in my case 800 MHz)

  If i resume from suspend while plugged to the AC charger, everything works as expected.
  --- 
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  gjm        2337 F.... pulseaudio
   /dev/snd/controlC0:  gjm        2337 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=98df70b7-f534-4ef6-8647-8e98200ccd64
  InstallationDate: Installed on 2013-12-06 (4 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Latitude E6540
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=22510d0e-a296-4b0f-a97a-27cb89a65419 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  saucy
  Uname: Linux 3.11.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 09/03/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0725FP
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/03/2013:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0725FP:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6540
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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