lightdm crashes during normal operation with no obvious cause

Bug #1441643 reported by James Tait on 2015-04-08
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lightdm (Ubuntu)

Bug Description

This has happened several times in the last few weeks, including twice yesterday. There is no obvious user action that triggers the crash: the first crash yesterday, I was composing an e-mail in the GMail pop-out editor; the second I was editing a config file on a remote server via SSH; previously, the crash has happened while I've been just reading something on the screen, not interacting with the computer at all.

The symptoms are a non-responsive display, with the exception of the mouse pointer. I'm not even able to switch to a different vt - just get a black screen. However, I *am* able to SSH into the machine, and when I did so yesterday I tried:

 * killing compiz
 * restarting the unity7 upstart job (my windows flashed briefly on the screen, then I got the login background)
 * restarting lightdm

The latter action got me to a login prompt, where I was able to login and start a standard desktop session and, thankfully, resume my screen and tmux sessions and not lose any work.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: lightdm 1.12.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 8 14:55:47 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-04 (277 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: lightdm
UpgradeStatus: Upgraded to utopic on 2015-01-31 (66 days ago)

James Tait (jamestait) wrote :
James Tait (jamestait) wrote :

Since it doesn't look like the bug report includes it, my display information is:

jtait@gazpacho:~$ sudo lshw -numeric -C display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller [8086:416]
       vendor: Intel Corporation [8086]
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:45 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)

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