Viktor Pal, thank you for reporting this and helping make Ubuntu better.
This bug was reported a while ago and there hasn't been any activity in
it recently. We were wondering if this is still an issue? If so, could
you please provide the information following
https://wiki.ubuntu.com/DebuggingKernelSuspendHibernateResume ? As well,
can you try with the latest development release of Ubuntu? ISO CD images
are available from http://cdimage.ubuntu.com/releases/ . However, note
you can only test Suspend, not Hibernate, when using a LiveCD. If the
issue remains, run the following  command in the development release
from a Terminal (Applications->Accessories->Terminal) as it will
automatically gather and attach updated debug information to this
report.

apport-collect -p linux <BUGNUMBER>

Additionally, if you could try to reproduce this with the upstream
mainline kernel that would be great. It will allow additional upstream
developers to examine the issue. Refer to
https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the
upstream kernel, please remove the 'needs-upstream-testing' tag. This
can be done by clicking on the yellow pencil icon next to the tag
located at the bottom of the bug description and deleting the 'needs-
upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not
boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

** Tags added: needs-upstream-testing

** Description changed:

- I'm not sure if this is actually a pm-utils or a kernel bug.
  So what happens is that after I hibernate my Laptop it does not recover in 
about 50% of the cases.
  During the recovery it simply unexpectedly restarts. Of course during this 
restart it does not enter the recovery phase again.
  This is the laptop model: 
http://www.ubuntu.com/certification/hardware/201012-6932:201101-7008
  
  The last entries from syslog (the entries before the entries of normal start):
  Oct 26 09:13:24 desktop kernel: [37911.699784] EXT4-fs (dm-1): re-mounted. 
Opts: errors=remount-ro,commit=0
  Oct 26 09:13:25 desktop kernel: [37913.433382] PM: Marking nosave pages: 
000000000009d000 - 0000000000100000
  Oct 26 09:13:25 desktop kernel: [37913.433389] PM: Marking nosave pages: 
0000000020000000 - 0000000020200000
  Oct 26 09:13:25 desktop kernel: [37913.433400] PM: Marking nosave pages: 
0000000040000000 - 0000000040200000
  Oct 26 09:13:25 desktop kernel: [37913.433412] PM: Marking nosave pages: 
00000000ca4e4000 - 00000000ca527000
  Oct 26 09:13:25 desktop kernel: [37913.433415] PM: Marking nosave pages: 
00000000ca792000 - 00000000ca967000
  Oct 26 09:13:25 desktop kernel: [37913.433425] PM: Marking nosave pages: 
00000000caba7000 - 0000000100000000
  Oct 26 09:13:25 desktop kernel: [37913.434524] PM: Basic memory bitmaps 
created
  
  This belongs to the hibernation. So the recovery does not generate
  entries in syslog during the recovery.
  
- That's really annoying. I can't rely on hibernation although I really would 
need it.
- I bought this laptop because it is Ubuntu certified :)
- I see this on the above mentioned page: Hibernate is disabled on this system
- But does it mean that it will never be supported on this system?
- 
- Could someone help me in how to debug this to be able to gather more 
information?
- If it's something I can correct I'm willing to do this., at least try.
- 
  I have used this documentation to debug this:
  http://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
  
  The test hangs when running it with this setting:
  echo processors > /sys/power/pm_test
  
+ WORKAROUND: I have used uswsusp instead of the hibernation integrated
+ into the kernel and it is very reliable. There is no error, it always
+ recovers from hibernation.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: pm-utils 1.4.1-8ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Wed Oct 26 19:19:48 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  PackageArchitecture: all
  SourcePackage: linux-meta
  UpgradeStatus: No upgrade log present (probably fresh install)
- --- 
+ ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  viktor     1874 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  viktor     1874 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'PCH'/'HDA Intel PCH at 0xf7c00000 irq 55'
-    Mixer name : 'Intel CougarPoint HDMI'
-    Components : 'HDA:111d76d1,102804b0,00100205 
HDA:80862805,80860101,00100000'
-    Controls      : 18
-    Simple ctrls  : 10
+  Card hw:0 'PCH'/'HDA Intel PCH at 0xf7c00000 irq 55'
+    Mixer name : 'Intel CougarPoint HDMI'
+    Components : 'HDA:111d76d1,102804b0,00100205 
HDA:80862805,80860101,00100000'
+    Controls      : 18
+    Simple ctrls  : 10
  DistroRelease: Ubuntu 11.10
  HibernationDevice: RESUME=UUID=8a50740e-dad7-4271-b50a-4d0024651f2a
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  MachineType: Dell Inc. Inspiron N5110
  NonfreeKernelModules: acpi_call
  Package: linux (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic 
root=/dev/mapper/system_vg-root_lv ro
  ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
  RelatedPackageVersions:
-  linux-restricted-modules-3.0.0-16-generic N/A
-  linux-backports-modules-3.0.0-16-generic  N/A
-  linux-firmware                            1.60
+  linux-restricted-modules-3.0.0-16-generic N/A
+  linux-backports-modules-3.0.0-16-generic  N/A
+  linux-firmware                            1.60
  StagingDrivers: mei
  Tags:  oneiric running-unity staging
  Uname: Linux 3.0.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 09/30/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0FTJWD
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd09/30/2011:svnDellInc.:pnInspironN5110:pvrNotSpecified:rvnDellInc.:rn0FTJWD:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron N5110
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/882184

Title:
  Dell N5110 laptop does not resume from hibernate

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