Public bug reported:
Logging in after a fresh boot works fine. Subsequently, after locking
the screen (either Super + L or allow to auto-lock) and letting the
screen turn off automatically, then attempting to wake the machine, only
a black screen and the mouse cursor are visible. The desktop and
authentication prompt do not re-appear, and though the mouse cursor
moves, the machine doesn't respond to keyboard entry except to switch to
a virtual console with Ctrl + Alt + 1 (2, 3, etc). From there it's
possible to reboot or kill -HUP lightdm, but in either case, the active
Unity login session is lost. I've check various log files, including
/var/log/lightdm/* but haven't noticed any obvious culprits.
This started after the following system updates on 2017-07-25
(/var/log/apt/history.log):
Start-Date: 2017-07-25 08:32:14
Commandline: apt upgrade
Requested-By: myusername (1000)
Upgrade: libfwup0:amd64 (0.5-2ubuntu4, 0.5-2ubuntu5),
unity-control-center-faces:amd64 (15.04.0+16.04.20160705-0ubuntu1,
15.04.0+16.04.20170214-0ubuntu1), linux-libc-dev:amd64 (4.4.0-83.106,
4.4.0-87.110), xserver-common:amd64 (2:1.18.4-0ubuntu0.2, 2:1.18.4-0ubuntu0.3),
libgtk2.0-bin:amd64 (2.24.30-1ubuntu1, 2.24.30-1ubuntu1.16.04.1),
imagemagick:amd64 (8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8),
libsystemd0:amd64 (229-4ubuntu17, 229-4ubuntu19), libmagickwand-6.q16-2:amd64
(8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8), libgail-common:amd64
(2.24.30-1ubuntu1, 2.24.30-1ubuntu1.16.04.1), libgtk2.0-0:amd64
(2.24.30-1ubuntu1, 2.24.30-1ubuntu1.16.04.1), coreutils:amd64 (8.25-2ubuntu2,
8.25-2ubuntu3~16.04), udev:amd64 (229-4ubuntu17, 229-4ubuntu19),
libepoxy0:amd64 (1.3.1-1ubuntu0.16.04.1, 1.3.1-1ubuntu0.16.04.2),
libgail18:amd64 (2.24.30-1ubuntu1, 2.24.30-1ubuntu1.16.04.1), fwupdate:amd64
(0.5-2ubuntu4, 0.5-2ubuntu5), libudev1:amd64 (229-4ubuntu17, 229-4ubuntu19),
unity-control-center:amd6
4 (15.04.0+16.04.20160705-0ubuntu1, 15.04.0+16.04.20170214-0ubuntu1),
imagemagick-6.q16:amd64 (8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8),
libmagickcore-6.q16-2-extra:amd64 (8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8),
systemd-sysv:amd64 (229-4ubuntu17, 229-4ubuntu19), session-shortcuts:amd64
(1.2, 1.2ubuntu0.16.04.1), libpam-systemd:amd64 (229-4ubuntu17, 229-4ubuntu19),
systemd:amd64 (229-4ubuntu17, 229-4ubuntu19), libmagickcore-6.q16-2:amd64
(8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8), libgtk2.0-common:amd64
(2.24.30-1ubuntu1, 2.24.30-1ubuntu1.16.04.1), xserver-xorg-core-hwe-16.04:amd64
(2:1.18.4-1ubuntu6.1~16.04.1, 2:1.18.4-1ubuntu6.1~16.04.2),
libunity-control-center1:amd64 (15.04.0+16.04.20160705-0ubuntu1,
15.04.0+16.04.20170214-0ubuntu1), imagemagick-common:amd64
(8:6.8.9.9-7ubuntu5.7, 8:6.8.9.9-7ubuntu5.8), fwupdate-signed:amd64
(1.11+0.5-2ubuntu4, 1.11.1+0.5-2ubuntu5)
End-Date: 2017-07-25 08:34:11
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 26 12:43:23 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-05-19 (68 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.2)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages xenial
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https://bugs.launchpad.net/bugs/1706760
Title:
lightdm/login session fails to resume after display is locked and goes
to black
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