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Message #66045
[Bug 1437719] Re: Black Screen on user switch
** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1437719/+attachment/4359187/+files/dmesg.txt
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https://bugs.launchpad.net/bugs/1437719
Title:
Black Screen on user switch
Status in xorg package in Ubuntu:
New
Bug description:
When switching users (primarly using Ctrl-Alt-F(7-10) the monitor will
sometimes go black. This happens once or twice a day, although on
occasion it doesn't occur for several days. It has occurred at least
once a week since I installed Ubuntu 14.04.1. It seems to be more of a
problem since moving to 14.04.2 - I did perform installation of the
Utopic Kernel, X, and MesaGL packages, but this is only perception. At
the same time I switched from Unity to Cinnamon (Jeremy Clarkson isn't
the only dinosaur roaming the world) - but I have confirmed that just
running Unity desktops is vunerable.
The display can be restored by sudo service lightdm restart - run from
an ssh login from another system.
Steps to consistently reproduce the problem is simply to perform
abusive user stress testing: switching from one user to another
rapidly: as soon as the display switches go back to the other. Usually
I can get a black screen with this method in under a minute with Unity
desktops.
I have the same issue with another system (Dell Vostro 3550) reported
in Bug #1437557 - submitting a new defect since this is different
hardware and even though the defects look the same there might be
differences underneath the hood causing the problem.
14.04.2 Trusty
3.16.0-33-generic.
I'll edit this report shortly with additional system info.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
Uname: Linux 3.16.0-33-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Sat Mar 28 14:45:26 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:063e]
InstallationDate: Installed on 2014-12-23 (95 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Inspiron 5547
ProcEnviron:
LANGUAGE=en_US
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-33-generic root=UUID=6eb0eadb-81ed-43ee-aab3-e3fe6b37ca75 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/12/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0598GM
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A05
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/12/2014:svnDellInc.:pnInspiron5547:pvrA05:rvnDellInc.:rn0598GM:rvrA00:cvnDellInc.:ct8:cvrA05:
dmi.product.name: Inspiron 5547
dmi.product.version: A05
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1~ubuntu2
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Fri Mar 27 15:14:18 2015
xserver.configfile: default
xserver.errors:
SynPS/2 Synaptics TouchPad: Read error 19
SynPS/2 Synaptics TouchPad: Read error 19
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 1110
vendor LGD
xserver.version: 2:1.16.0-1ubuntu1.2~trusty2
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