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On 2014-06-24T14:26:42+00:00 Bugs-i wrote:

Copied from launchpad.

After the screen locks I am unable to log back in because the screen
with the login prompt is black, and the screen on my laptop just shows
the Ubuntu logo.

Furthermore, if I then unplug the external monitor (in an attempt to
force the log in option to be displayed on the laptop) the laptop screen
then goes black and I can't do anything at all.

I can't reproduce this if I select "lock screen" from the UI, but it
happens reliably if it locks due to inactivity.

Other info:
- I am running a fresh install of 14.04
- I have it set to lock after 5 min of inactivity, and require login after lock
- I have an external monitor, configured to be on the left side of the laptop screen

Reply at:
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1315369/comments/58

------------------------------------------------------------------------
On 2014-06-24T14:36:01+00:00 Bugs-i wrote:

Created attachment 101671
dmesg with WARN_ON's triggering

Reply at:
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1315369/comments/59


** Changed in: xserver-xorg-video-intel
       Status: Unknown => Confirmed

** Changed in: xserver-xorg-video-intel
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1315369

Title:
  Log in not available after lock screen with multi-monitor

Status in Unity:
  Invalid
Status in X.org xf86-video-intel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  Invalid
Status in “linux” source package in Trusty:
  Confirmed
Status in “unity” source package in Trusty:
  Confirmed

Bug description:
  After the screen locks I am unable to log back in because the screen
  with the login prompt is black, and the screen on my laptop just shows
  the Ubuntu logo.

  Furthermore, if I then unplug the external monitor (in an attempt to
  force the log in option to be displayed on the laptop)  the laptop
  screen then goes black and I can't do anything at all.

  I can't reproduce this if I select "lock screen" from the UI, but it
  happens reliably if it locks due to inactivity.

  Other info:
  - I am running a fresh install of 14.04
  - I have it set to lock after 5 min of inactivity, and require login after lock
  - I have an external monitor, configured to be on the left side of the laptop screen
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jane       2184 F.... pulseaudio
   /dev/snd/controlC0:  jane       2184 F.... pulseaudio
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=61f52096-031e-4e3d-b1ae-e504b3b3edec
  InstallationDate: Installed on 2014-05-01 (20 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
  MachineType: Dell Inc. Dell System XPS L321X
  Package: unity 7.2.0+14.04.20140416-0ubuntu1
  PackageArchitecture: i386
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu--vg-root ro persistent quiet splash
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  Tags:  trusty trusty
  Uname: Linux 3.13.0-24-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/09/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 085X6F
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd04/09/2012:svnDellInc.:pnDellSystemXPSL321X:pvr:rvnDellInc.:rn085X6F:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L321X
  dmi.sys.vendor: Dell Inc.

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