Bug#841712: systemd: Display black on resume from suspend

[Bill Gribble]

To answer your question in the other followup, yes, I made a mistake 
titling this bug.
This is a hibernate-related problem, not suspend.

On 10/22/2016 11:12 AM, Michael Biebl wrote:
> This is what "systemctl hibernate" uses.
> Can you run this command and see if that works?

"systemctl hibernate", as either root or a non-root user, resumes with 
black display.

"echo disk > /sys/power/state" (works only as root) resumes with 
functioning display.

> Having "pm-utils" installed is no longer recommended fwiw. I would
> uninstall it. Do you have other packages like
> "laptop-mode-tools" or "hibernate" installed, which might interfere?

I had pm-utils and laptop-mode-tools installed.  I've purged them; no 
difference.
> Do you have any custom hooks in
> /lib/systemd/system-sleep/ ?

Nothing custom, just the packager-supplied ones from "hdparm" and 
"network-manager"

> What's the output of systemctl show hibernate.target

Id=hibernate.target
Names=hibernate.target
Wants=anacron-resume.service
BindsTo=systemd-hibernate.service
Before=anacron-resume.service
After=systemd-hibernate.service
Documentation=man:systemd.special(7)
Description=Hibernate
LoadState=loaded
ActiveState=inactive
SubState=dead
FragmentPath=/lib/systemd/system/hibernate.target
UnitFileState=static
UnitFilePreset=enabled
StateChangeTimestampMonotonic=0
InactiveExitTimestampMonotonic=0
ActiveEnterTimestampMonotonic=0
ActiveExitTimestampMonotonic=0
InactiveEnterTimestampMonotonic=0
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=no
OnFailureJobMode=replace
IgnoreOnIsolate=no
NeedDaemonReload=no
JobTimeoutUSec=infinity
JobTimeoutAction=none
ConditionResult=no
AssertResult=no
ConditionTimestampMonotonic=0
AssertTimestampMonotonic=0
Transient=no
StartLimitIntervalSec=10000000
StartLimitBurst=5
StartLimitAction=none