[Apple Inc. MacBookAir5,1] suspend/resume failure

Suspended by closing the lid, and after opening the lid the system was unresponsive. The only sign of life was that the keyboard backlight was on.

ProblemType: KernelOops
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-23-generic 3.13.0-23.45
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
Annotation: This occured during a previous suspend and prevented it from resuming properly.
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sforshee 2533 F.... pulseaudio
Date: Tue Apr 8 09:47:52 2014
ExecutablePath: /usr/share/apport/apportcheckresume
Failure: suspend/resume
HibernationDevice: RESUME=UUID=372d2638-c99f-4051-93a9-74ab30c0b144
InstallationDate: Installed on 2012-10-24 (531 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
InterpreterPath: /usr/bin/python3.4
MachineType: Apple Inc. MacBookAir5,1
ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=fba6dd0c-e98f-4680-80ee-692eefe6e633 ro quiet splash intel_pstate=enable acpi_backlight=vendor 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-3.13.0-23-generic N/A
 linux-backports-modules-3.13.0-23-generic N/A
 linux-firmware 1.127
SourcePackage: linux
Title: [Apple Inc. MacBookAir5,1] suspend/resume failure
UpgradeStatus: Upgraded to trusty on 2014-01-16 (81 days ago)
UserGroups:

dmi.bios.date: 05/22/2012
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA51.88Z.00EF.B00.1205221442
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-66F35F19FE2A0D05
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir5,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-66F35F19FE2A0D05
dmi.modalias: dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B00.1205221442:bd05/22/2012:svnAppleInc.:pnMacBookAir5,1:pvr1.0:rvnAppleInc.:rnMac-66F35F19FE2A0D05:rvrMacBookAir5,1:cvnAppleInc.:ct10:cvrMac-66F35F19FE2A0D05:
dmi.product.name: MacBookAir5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.