Further tests of versions of kernels 3.11 and 3.13, and Xstacks saucy and trusty on 12.04 showed only black screens. => Now saucy too !!
But I've found a workaround for my config/setup (12.04 with kernel and Xstack from trusty with nvidia driver, lightdm with kde, and only hibernate used); Boot your system to lightdm, then login to your Desktop Environment , let it finish ... After that logout back to lightdm screen and login again ! => Now try to hibernate, after the resume there is no black screen anymore and you can unlock the screen and use your desktop!! My résumé after testing is that maybe there is a race condition in the services/daemons (acpid, dbus, lightdm) or different bugs are playing together (Kernel, X, drivers, daemons). That's why I've downgraded lightdm's version in 12.04, but without success, only the workaround, described above, helps for me. Please help to solve this nasty bug, because it is now in 12.04 too ! Maybe lightdm changes? Or system components like dbus? => Browsing the lightdm versions in 12.04 lightdm (1.2.3-0ubuntu2.4) precise-proposed; urgency=low [ Robert Ancell ] * debian/patches/06_config_directory.patch: - Backport conf.d configuration support (LP: #1190425) [ Alberto Milone ] * debian/patches/07_add_display-stopped-script.patch: - Backport support for the display-stopped-script entry in the configuration file (LP: #1259237) -- Alberto Milone <email address hidden> Wed, 18 Dec 2013 14:31:49 +0100 lightdm (1.2.3-0ubuntu2.3) precise; urgency=low * debian/guest-account: disable screen locking in a more reliable way. Rather than trying to write a key for another user, while setting up the guest user account, just set up an autostart desktop that will set it during the login (lp: #951000) -- Sebastien Bacher <email address hidden> Mon, 08 Jul 2013 13:47:53 +0200 Thanks, Bernhard -- 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/1283938 Title: [Samsung NP535U4X-S01TH] Ubuntu 14.04 blank screen after wakeup from sleep Status in “linux” package in Ubuntu: Incomplete Bug description: In 14.04 after wakeup from suspend, the notebook screen goes blank while the OS and the hardware is awake (I can also press Ctrl+F1 and Ctrl+Alt+Del to reboot the system). Changeing "quiet splash" to "nomodeset" in /etc/default/grub allows the wakeup, but the pc is really slow (can't be used). WORKAROUND: This problem is not happening with the AMD property drivers. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xserver-xorg-video-ati 1:7.3.0-1ubuntu2 ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3 Uname: Linux 3.13.0-11-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.13.2-0ubuntu5 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Mon Feb 24 12:58:07 2014 DistUpgraded: Fresh install DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: virtualbox, 4.3.6, 3.13.0-11-generic, x86_64: installed GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7500G] [1002:990a] (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Device [144d:c660] Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M] [1002:6841] (rev ff) (prog-if ff) InstallationDate: Installed on 2014-02-22 (1 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140218) MachineType: SAMSUNG ELECTRONICS CO., LTD. 535U4C ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-11-generic root=UUID=9f8c7e92-a6ea-41fd-9489-a256c8b9f5d5 ro quiet splash vt.handoff=7 SourcePackage: xserver-xorg-video-ati UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/03/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P06RAF.N93.130403.LEO dmi.board.asset.tag: No Asset Tag dmi.board.name: NP535U4X-S01TH dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: SEC_SW_REVISION_1234567890ABCD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP06RAF.N93.130403.LEO:bd04/03/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn535U4C:pvrP06RAF:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP535U4X-S01TH:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 535U4C dmi.product.version: P06RAF dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. version.compiz: compiz 1:0.9.11+14.04.20140218-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc1-1ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc1-1ubuntu4 version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Mon Feb 24 12:54:54 2014 xserver.configfile: default xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension. xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.15.0-1ubuntu6 xserver.video_driver: radeon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1283938/+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