Have you tried using `Ctrl` + `Alt` + `F1` to switch to a logon terminal, logging in and then using the command `sudo lightdm restart`? That worked for me (sometimes) when I was testing 13.04 in VirtualBox...
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1192304 Title: Low graphics mode Status in “xorg” package in Ubuntu: New Bug description: After an update and reboot today, my computer doesn't start lightdm normally and sometimes, freezes on Plymouth screen, making me unable to start a terminal session. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: xorg 1:7.7+1ubuntu4 ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2 Uname: Linux 3.8.0-26-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.9.2-0ubuntu8.1 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 Date: Tue Jun 18 16:25:57 2013 DistUpgraded: Fresh install DistroCodename: raring DistroVariant: ubuntu EcryptfsInUse: Yes ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:3920] InstallationDate: Installed on 2013-05-14 (34 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: LENOVO 0913 MarkForUpload: True ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-26-generic root=UUID=c0651cb4-a95e-49d0-9770-0e0e158e140c ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/07/2010 dmi.bios.vendor: LENOVO dmi.bios.version: 29CN31WW(V2.08) dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Base Board Product Name dmi.board.vendor: LENOVO dmi.board.version: Base Board Version dmi.chassis.asset.tag: Chassis Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnLENOVO:bvr29CN31WW(V2.08):bd09/07/2010:svnLENOVO:pn0913:pvrIdeapadZ460:rvnLENOVO:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion: dmi.product.name: 0913 dmi.product.version: Ideapad Z460 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.43-0ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.2~git20130515.392f6cfc-0ubuntu0+mir1-jenkins71 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.2~git20130515.392f6cfc-0ubuntu0+mir1-jenkins71 version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu9+xmir1~raring1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0+xmir2504-0~raring1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.9+xmir5862-0~raring1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.8+xmir2338-0~raring1 xserver.bootTime: Tue Jun 18 16:21:57 2013 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.13.3-0ubuntu9+xmir1~raring1 xserver.video_driver: intel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1192304/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp