Comment 7 for bug 1374830

I did test the scenario with and without a variety of lockers and I
concluded that the bug is with xfce4-power-manager and not light-locker
or any other locking program. The issue only happens in the very
specific scenario with xfce4-power-manager, regardless of any other
configuration as far as I can tell (and I did test a lot), and simply
disabling xfce4-power-manager fixes it.

On Wed, Jan 14, 2015 at 5:45 PM, Thaddaeus Tintenfisch
<email address hidden> wrote:
> Did you test it without screen locking? It is possible that
> light-locker
> interferes in some way and triggers the bug.
>
> --
> You received this bug notification because you are subscribed to the
> bug
> report.
> https://bugs.launchpad.net/bugs/1374830
>
> Title:
> Closing laptop lid before system can suspend causes black screen
> upon
> login after resume
>
> Status in xfce4-power-manager package in Ubuntu:
> New
>
> Bug description:
> On a fresh install of Xubuntu 14.04.1, with HandleLidSwitch=ignore
> set
> in /etc/systemd/logind.conf and the lid switch setting set to
> 'Nothing' in xfce4-power-manager-settings, using the suspend key on
> the keyboard to initiate suspend and then closing the laptop lid
> before the system can fully suspend results in a black screen upon
> logging in when the laptop is resumed. This bug still occurs using
> packages from the staging ppa.
>
> Edit for clarity:
> I believe this is different from bug #1303736 and bug #1259339
> because it does not occur as a general problem with suspending and it
> does not involve suspension triggered by the closing of the laptop
> lid. I can suspend and resume successfully in every other case, using
> any other method, with no issues. This problem occurs only when the
> laptop lid switch is set to ignore or do "nothing", the whisker menu,
> a keyboard button, or some other method is used to initiate a
> suspension, and the user closes the laptop before the laptop can
> fully suspend. I do not believe this to be an issue with light-locker
> or another package as the problem is solved by simply killing (or
> uninstalling) xfce4-power-manager and using systemd's logind.conf to
> handle power switches. I believe this problem will become more
> widespread when the fix for bug #1307545 is imeplemented. This may be
> related to the patch which was implemented in order to fix the
> similar bug #1303736 as noted in
> https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-settings/+bug/1303736/comments/178.
> None of the fixes or workarounds mentioned in any of the above bug
> reports work for this bug.
>
> Expected behavior:
> Logging in after resuming from suspend should work exactly as it
> does from a cold boot.
>
> Bug behavior:
> After resuming from suspend mode, logging in results in a black
> screen. This occurs exclusively when shutting the laptop lid, with
> the lid switch set to do nothing, before the system suspends.
>
> Steps to reproduce:
> 1) Set and uncomment HandleLidSwitch=ignore in
> /etc/systemd/logind.conf
> 2) ensure that lid switch suspension is diabled in
> xfce4-power-manager-settings
> 3) ensure that "lock screen upon suspend" is enabled in light
> locker settings
> 4) Press suspend hotkey on laptop, and quickly close the lid
> before the laptop is able to suspend
> 5) After laptop suspends, open lid to resume
> 6) Move mouse to wake up display, then log in
> 7) Screen goes black and lightdm must be restarted in order to
> wake it up (other workarounds such as 'xset dpms force on -d :0' do
> not work)
>
> Workaround or "solution":
> Kill or uninstall the xfce4-power-manager package, and use
> /etc/systemd/logind.conf to control lid and power switches. Problem
> does not occur when xfce4-power-manager is not running.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 14.04
> Package: xfce4-power-manager 1.2.0-3ubuntu4.1
> ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
> Uname: Linux 3.13.0-36-generic x86_64
> ApportVersion: 2.14.1-0ubuntu3.4
> Architecture: amd64
> CurrentDesktop: XFCE
> Date: Sat Sep 27 14:31:33 2014
> InstallationDate: Installed on 2014-09-19 (7 days ago)
> InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release
> amd64 (20140723)
> SourcePackage: xfce4-power-manager
> UpgradeStatus: No upgrade log present (probably fresh install)
>
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