I can't confirm if this is a regression as this machine is brand new and
I only had trusty on it for a little while before upgrading. This issue
may be related to uefi booting, as suspend seemed to work when booting
in legacy bios mode (but that had a bug that made the system unbootable
after a while).

Tested the upstream kernel specified and the bug seems to be in that
one, too.

** Description changed:

  As requested by apw, here is the bug report for suspend problem on
- Macbook retina. The issue is that activating suspend seems to take
- forever until the machine actually goes to sleep (which you can tell by
- they keyboard backlight going off). The attached logs were gathered in
- the following way:
+ Macbook retina. The issue is when activating suspend, the monitor turns
+ off but the machine gets fully suspended only some time later. The
+ actual start of suspend can be detected by they keyboard backlight going
+ off. The attached logs were gathered in the following way:
  
  - power cycle machine
  - suspend
  - wake up
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.15.0-2-generic 3.15.0-2.6
  ProcVersionSignature: Ubuntu 3.15.0-2.6-generic 3.15.0-rc6
  Uname: Linux 3.15.0-2-generic x86_64
  ApportVersion: 2.14.2-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  jpakkane   2097 F.... pulseaudio
-  /dev/snd/controlC1:  jpakkane   2097 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  jpakkane   2097 F.... pulseaudio
+  /dev/snd/controlC1:  jpakkane   2097 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May 27 15:54:53 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-05-22 (4 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac 
(20140417)
  MachineType: Apple Inc. MacBookPro11,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.15.0-2-generic 
root=UUID=aec3f04d-865c-4f0f-9872-d8953e94278d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.15.0-2-generic N/A
-  linux-backports-modules-3.15.0-2-generic  N/A
-  linux-firmware                            1.129
+  linux-restricted-modules-3.15.0-2-generic N/A
+  linux-backports-modules-3.15.0-2-generic  N/A
+  linux-firmware                            1.129
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-05-27 (0 days ago)
  dmi.bios.date: 02/12/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP111.88Z.0138.B07.1402121134
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-189A3D4F975D5FFC
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-189A3D4F975D5FFC
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B07.1402121134:bd02/12/2014:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
  dmi.product.name: MacBookPro11,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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https://bugs.launchpad.net/bugs/1323645

Title:
  [MacBookPro11,1] Suspend delayed because of some timeout issue

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