Public bug reported:
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 that I will log a defect
against later.
Currently attached is the dmesg log. I will come back in and add Xorg
and i915 and regdumps.
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: Fri Mar 27 22:34:36 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:04cd]
Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD
6630M/6650M/6750M/7670M/7690M] [1002:6741] (rev ff) (prog-if ff)
InstallationDate: Installed on 2014-11-25 (122 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Vostro 3550
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=f2a7816d-d44b-4837-881c-51995c1f8a8b ro plymouth:debug splash quiet
drm.debug=0xe
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/03/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0PD77K
dmi.board.vendor: Dell Inc.
dmi.board.version: A11
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias:
dmi:bvnDellInc.:bvrA11:bd08/03/2012:svnDellInc.:pnVostro3550:pvrNotSpecified:rvnDellInc.:rn0PD77K:rvrA11:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Vostro 3550
dmi.product.version: Not Specified
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 22:24:12 2015
xserver.configfile: default
xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 5539
vendor CMO
xserver.version: 2:1.16.0-1ubuntu1.2~trusty2
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty ubuntu
** Attachment added: "dmesg log with extra info for X problems."
https://bugs.launchpad.net/bugs/1437557/+attachment/4358452/+files/dmesg.txt
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1437557
Title:
Black screen on user switch.
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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1437557/+subscriptions
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