Ok, the magic workaround is to disable the "Legacy option ROM" feature in the BIOS, which happens to be the BIOS default. Go figure why the kernel stopped liking whatever that setting implies.
-- 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/1580311 Title: Laptop boots only if external display connected Status in linux package in Ubuntu: Incomplete Bug description: Hi, Since updating to 16.04 with kernel vmlinuz-4.4.0-22-generic my laptop no longer completes the boot sequence under a normal boot scenario - the "loading initrd..." message is displayed, then, when the VGA modesetting usually kicks the display into a higher resolution, the screen blanks and the startup apparently halts. This is a regression from 4.2 series kernels. I can successfully bring up the system if I revert to 4.2.0-35, and also if I boot 4.4 with the failsafe setting (but then X is painfully slow, as its using software) Matt ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5 Uname: Linux 4.2.0-35-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2 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: Tue May 10 20:29:56 2016 DistUpgraded: 2016-05-04 00:10:55,503 DEBUG icon theme changed, re-reading DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: virtualbox, 5.0.18, 4.2.0-35-generic, x86_64: installed virtualbox, 5.0.18, 4.4.0-21-generic, x86_64: installed virtualbox, 5.0.18, 4.4.0-22-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GpuHangFrequency: Continuously GpuHangReproducibility: Yes, I can easily reproduce it GpuHangStarted: Immediately after installing this version of Ubuntu GraphicsCard: Intel Corporation Device [8086:22b1] (rev 21) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:06ac] InstallationDate: Installed on 2015-05-12 (364 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: Dell Inc. Inspiron 15-3552 PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log' ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-35-generic.efi.signed root=/dev/mapper/ubuntu--15--vg-root ro plymouth:debug i8042.nopnp=1 vesafb.invalid=1 drm.debug=0xe SourcePackage: xorg Symptom: display Title: Xorg freeze UpgradeStatus: Upgraded to xenial on 2016-05-03 (6 days ago) dmi.bios.date: 11/17/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: 4.0.3 dmi.board.name: 0CP33T dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvr4.0.3:bd11/17/2015:svnDellInc.:pnInspiron15-3552:pvr4.0.3:rvnDellInc.:rn0CP33T:rvrA00:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Inspiron 15-3552 dmi.product.version: 4.0.3 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Tue May 10 12:26:45 2016 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 5578 vendor CMN xserver.version: 2:1.18.3-1ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1580311/+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
