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[Rob Day <rkd@xxxxxxxxx>]

I did some more digging and realised that this was due to a
misconfigured BIOS - I'd been too aggressive in disabling hardware to
save power. Once I restored it to the default setting, suspend/resume
works fine - from the pm_trace logs I suspect the issue was that I'd
disabled the serial port.

I'm happy for this bug to be closed, or changed to a lower priority.
I'll rename it to reflect the actual bug.

** Summary changed:

- Dell Latitude E7240 does not resume from suspend
+ Dell Latitude E7240 does not resume from suspend with non-default BIOS settings (when serial port is disabled?)

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https://bugs.launchpad.net/bugs/1295382

Title:
  Dell Latitude E7240 does not resume from suspend with non-default BIOS
  settings (when serial port is disabled?)

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Seen with 14.04 beta 1 (Trusty).

  When I suspend my Dell Latitude E7240 laptop (either by closing the
  lid, running pm-suspend or selecting Sleep from the KDE menu) it
  suspends successfully and the power LED flashes. When I try and resume
  it (either by opening the laptop or by pressing the power button), it
  starts to resume (the power button stops flashing and is fully lit up)
  but nothing appears on the screen and my wifi indicator starts
  flashing (on for ~4 seconds, off for ~4 seconds) until I power off the
  machine by holding the power button down.

  I've reproduced this with linux-image-3.14.0-031400rc7-generic (the
  latest non-nightly kernel mainline), as recommended by
  https://wiki.ubuntu.com/DebuggingKernelSuspend. I've also booted into
  the 12.04 Kubuntu install CD and suspended that, which experiences the
  same problem.

  I'm using the latest BIOS (A08). I'm reasonably confident this isn't a
  problem with my wifi card - I experience the same symptoms when it is
  disabled in the BIOS or switched off by the hardware switch.

  I've followed the pm_trace instructions at
  https://wiki.ubuntu.com/DebuggingKernelSuspend and attached it. That
  does include the lines:

  [    1.458151]   Magic number: 6:635:599
  [    1.458165] serial8250 serial8250: hash matches

  However, lsmod doesn't show a serial8250 module loaded.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-generic 3.13.0.12.16
  ProcVersionSignature: Ubuntu 3.13.0-12.32-generic 3.13.4
  Uname: Linux 3.13.0-12-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  rkd        1765 F.... pulseaudio
                        rkd        2010 F.... pulseaudio
   /dev/snd/controlC0:  rkd        1765 F.... pulseaudio
                        rkd        2010 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Mar 20 21:23:36 2014
  HibernationDevice: RESUME=UUID=2e1c8ed9-ac52-4045-a6b2-affdbd3a0594
  InstallationDate: Installed on 2014-03-20 (0 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140227)
  MachineType: Dell Inc. Latitude E7240
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-12-generic root=UUID=de5a2758-01bf-4e83-86f3-6eca4f55fdb2 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-12-generic N/A
   linux-backports-modules-3.13.0-12-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/18/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0R8R7K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd02/18/2014:svnDellInc.:pnLatitudeE7240:pvr01:rvnDellInc.:rn0R8R7K:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7240
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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