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suspend to RAM failed before it was completed:
* fan was still on and
* Fn-F1- & Fn-F4-status LEDs were still on (signifying muted speakers and microphone respectively)
* nevertheless the general ThinkPad LED (the i's dot) (/proc/acpi/ibm/led 0) behaved like normal: slowly blinking, which normally means "I'm suspended to RAM."
* however resume was impossible: wakeup failed through mouse clicks, various keyboard keys and combinations and also the power key, only a hard reset (5s or so holding down the power key) could bring it back to life

Adding the kernel cmdline option acpi_sleep=nonvs was of no avail, too.

I recently upgraded to a new BIOS v2.07 [1], I think the problem exists
since then.

Update
======
I confirmed that this is definitely a BIOS issue. The last working BIOS is v1.61 [2], so the change was introduced by v2.07 [1]. Installing the latest v2.08 [3] does not fix this problem.

So this is the changelog for v2.07 [1]:
- (Fix) Fixed an issue that system will auto wakeup after shutdown when battery capacity is under 15% on DC only.
- (Fix) Fixed an issue related to APS.
- (New) Added support for new GPU config.

By the way, I could not find a new GPU config option in the BIOS, same
old choice <Integrated> vs. <Optimus>, nothing new.

[1] http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj10wd.iso
    http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj10wd.txt
[2] http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj09wd.iso
    http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj09wd.txt
[3] http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj11wd.iso
    http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/j9uj11wd.txt

ProblemType: KernelOops
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-30-generic 3.13.0-30.54
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
Annotation: This occured during a previous suspend and prevented it from resuming properly.
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  xxxxxx     2499 F.... pulseaudio
 /dev/snd/controlC0:  xxxxxx     2499 F.... pulseaudio
Date: Tue Jun 17 17:16:54 2014
DuplicateSignature: suspend/resume:LENOVO 20C6S00200:J9ET87WW (2.07 )
ExecutablePath: /usr/share/apport/apportcheckresume
ExecutableTimestamp: 1400281919
Failure: suspend/resume
HibernationDevice: RESUME=UUID=2ecc68b9-65e3-4cee-9b2a-d41ff651e4e8
InstallationDate: Installed on 2014-01-06 (161 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
InterpreterPath: /usr/bin/python3.4
MachineType: LENOVO 20C6S00200
ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
ProcCwd: /
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-30-generic.efi.signed root=/dev/mapper/ubuntuvg-root ro quiet splash "acpi_osi=!Windows 2012" pcie_aspm=force intel_pstate=enable vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-30-generic N/A
 linux-backports-modules-3.13.0-30-generic  N/A
 linux-firmware                             1.127.3
SourcePackage: linux
Title: [LENOVO 20C6S00200] suspend/resume failure
UpgradeStatus: Upgraded to trusty on 2014-06-12 (5 days ago)
UserGroups:

dmi.bios.date: 05/13/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: J9ET87WW (2.07 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20C6S00200
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrJ9ET87WW(2.07):bd05/13/2014:svnLENOVO:pn20C6S00200:pvrThinkPadEdgeE540:rvnLENOVO:rn20C6S00200:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20C6S00200
dmi.product.version: ThinkPad Edge E540
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-kerneloops kernel-bug-exists-upstream kernel-bug-exists-upstream-3.16-rc1 latest-bios-2.08 resume saucy suspend trusty
-- 
[Lenovo ThinkPad Edge E540] suspend/resume failure
https://bugs.launchpad.net/bugs/1331077
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