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[Allan Crooks <allan@xxxxxxxxxx>]

> Since I reported the problem I changed this power adapter and did not
see the problem again. Do you use a non-Dell or non-compatible Dell
power adapter ?

I've always been using the standard Dell power adapter that came with
the laptop. The last time it happened, the laptop was running from
battery.  The problem does seem to be a lot less frequent, but when it
does happen, it seems the CPU is pegged at 756 MHz (a number in the
700's anyway, I can't recall the precise figure at the moment.) I've
been using an applet to keep an eye on the frequency.

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https://bugs.launchpad.net/bugs/1264346

Title:
  [Dell Latitude E6520] After suspend, machine very slow with ondemand
  governor

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After several suspend/resume cycles and several days of uptime, using the ondemand governor the system is very slow to answer some inputs. The text output pauses for several seconds while I am typing this text. Trying to scroll a firefox window takes several seconds. Switching tabs in firefox takes several seconds:
  cat /sys/devices/system/cpu/c*/cpufreq/scaling_governor
  ondemand
  ondemand
  ondemand
  ondemand

  WORKAROUND: Setting the governor to "performance" fixes this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.23
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bonnaudl   2373 F.... pulseaudio
  Date: Thu Dec 26 18:17:23 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=cf81afe7-8427-45fa-9149-c11d060a5a26
  InstallationDate: Installed on 2013-04-27 (243 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. Latitude E6520
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=749a9901-bdd3-4b5f-b80e-69414667e058 ro quiet splash vt.handoff=7
  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
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-01 (86 days ago)
  dmi.bios.date: 02/28/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0NVF5K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd02/28/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0NVF5K:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6520
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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