Public bug reported: I have a lenovo T440p laptop (Intel Haswell integrated graphics + nvidia GPU, I'm not using the nvidia at all). I have a docking station with a single 2560x1440 displayport monitor attached, and I typically use my laptop in the docking station with the lid closed (so I have a single 2560x1440 display active).
If I suspend while docked, undock while suspended, and then resume, the laptop screen doesn't light up. I am able to partially recover if I do the alt-f1 to switch VTs and then do a suspend/resume cycle -- in that case I can get the text console on the internal laptop screen. However, switching back to the X VT turns the screen off, and no amount of monkeying that I've tried (including fiddling with xrandr) brings X back -- I end up needing to reboot. It does work fine if I boot undocked, use X on the laptop screen for a while, then suspend and dock while suspended. If I resume when docked, switching to the displayport monitor works perfectly. Also suspend/resume while undocked works fine. The only bad case is if I suspend while docked and resume undocked. This is a regression some time in the 14.10 cycle -- ~1 month ago, I didn't have this problem, but I'm not sure which update brought the issue in. It is 100% reproducible for me and I'm happy to try whatever debugging steps are helpful. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu1 ProcVersionSignature: Ubuntu 3.16.0-6.11-generic 3.16.0-rc7 Uname: Linux 3.16.0-6-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.5-0ubuntu1 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: Wed Jul 30 11:02:08 2014 DistUpgraded: Fresh install DistroCodename: utopic DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:221d] NVIDIA Corporation GK208M [GeForce GT 730M] [10de:1290] (rev a1) (prog-if 00 [VGA controller]) InstallationDate: Installed on 2014-01-11 (200 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109) MachineType: LENOVO 20ANCTO1WW PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log' ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-6-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro splash quiet plymouth:debug=1 vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/18/2013 dmi.bios.vendor: LENOVO dmi.bios.version: GLET64WW (2.18 ) dmi.board.asset.tag: Not Available dmi.board.name: 20ANCTO1WW dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGLET64WW(2.18):bd12/18/2013:svnLENOVO:pn20ANCTO1WW:pvrThinkPadT440p:rvnLENOVO:rn20ANCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20ANCTO1WW dmi.product.version: ThinkPad T440p dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.11+14.10.20140707-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.54-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.2.3-0ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.2.3-0ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu8 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Tue Jul 29 23:16:22 2014 xserver.configfile: default xserver.errors: intel: Failed to load module "dri3" (module does not exist, 0) intel: Failed to load module "present" (module does not exist, 0) xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 1034 vendor LGD xserver.version: 2:1.15.1-0ubuntu8 ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 ubuntu utopic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1350479 Title: laptop display doesn't turn on if I suspend while docked, resume after undocking To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1350479/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs