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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 freeze ubuntu xenial
-- 
Kernel hangs at boot with modesettings
https://bugs.launchpad.net/bugs/1580311
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