After observing a lot I noticed that alongside with the intermittent failure also had an error message "PM: Device 00:06 failed to resume: error -19" that always appeared for a second before hibernate/suspend.
Furthermore sometimes the desktop have returned and whenever I moved the mouse (touchpad) I had an endless list of messages in syslog ([drm: hsw_unclaimed_reg_clear] * ERROR * Unknown unclaimed register before writing to 70088). This led me to investigate the touchpad. Researching I found mention in various forums about the touchpad on some SONY VAIOs notebooks where was suggested inserting the following kernel parameter in /etc/default/grub. GRUB_CMDLINE_LINUX = "i8042.nopnp" After that run sudo update-grub and reboot. Hardly believe it, but thereafter there were no more error messages and the notebook hibernate/suspend and resume without problem. I'm using now kernel 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux (trusty proposed) fglrx 14.20(beta) (.deb packages created using ATI installer using orientations from "http://wiki.cchtml.com/index.php/Ubuntu_Trusty_Installation_Guide#Removing_Catalyst.2Ffglrx") -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1305109 Title: [Dell Inc. Vostro 3555] /resume failure [non-free: wl fglrx] Status in “linux” package in Ubuntu: Confirmed Bug description: I believe this is the same problem reported in bug #1304582. 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 NonfreeKernelModules: wl fglrx Annotation: This occured during a previous hibernate and prevented it from resuming properly. ApportVersion: 2.14.1-0ubuntu1 Architecture: amd64 Date: Wed Apr 9 07:32:50 2014 ExecutablePath: /usr/share/apport/apportcheckresume Failure: /resume HibernationDevice: RESUME=UUID=bf09d2c3-bd1f-4392-87e5-cecf9672d548 InstallationDate: Installed on 2013-10-27 (163 days ago) InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1) InterpreterPath: /usr/bin/python3.4 MachineType: Dell Inc. Vostro 3555 ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume ProcEnviron: TERM=linux PATH=(custom, no user) ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=cc3e7040-0e1d-44fc-98ee-9e62a6396350 ro quiet splash 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: [Dell Inc. Vostro 3555] /resume failure [non-free: wl fglrx] UpgradeStatus: Upgraded to trusty on 2014-04-07 (1 days ago) UserGroups: dmi.bios.date: 08/09/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A03 dmi.board.name: 0K89MF dmi.board.vendor: Dell Inc. dmi.board.version: A03 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA03:bd08/09/2011:svnDellInc.:pnVostro3555:pvrNotSpecified:rvnDellInc.:rn0K89MF:rvrA03:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Vostro 3555 dmi.product.version: Not Specified dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1305109/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp