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

[Bill Gribble]

Package: systemd
Version: 231-9
Severity: normal

My machine is a 4-year-old Dell E6430.  It's worked flawlessly with 
hibernate
and suspend-to-ram for years.  Recently (sometime in Summer 2016) the 
display
started going black at the point of resume-from-hibernate when the GUI 
should
appear.

I am entering hibernate by pressing the power button, which I have mapped to
the "hibernate" action in Gnome.  I believe this uses the systemd hibernate
action.

No combination of switching VTs, keyboard/mouse input, or anything else 
can get
the display on when it is in this state.

I know the system has resumed, because if I close the laptop lid to 
suspend-to-
ram and then open again the display lights up properly and I'm back where I
should be.

I have hibernated the system using other means with differing results:

  * "echo disk > /sys/power/state" hibernates and resumes successfully with
active display after resume

  * "pm-hibernate" with no quirks behaves exactly like the power-button 
action
(display black on resume)

  * "pm-hibernate --quirk-dpms-on" hibernates and resumes properly




-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
   APT prefers unstable
   APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.115
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10.95-5
ii  libaudit1       1:2.6.7-1
ii  libblkid1       2.28.2-1
ii  libc6           2.24-5
ii  libcap2         1:2.25-1
ii  libcryptsetup4  2:1.7.2-4
ii  libgcrypt20     1.7.3-2
ii  libgpg-error0   1.24-1
ii  libidn11        1.33-1
ii  libip4tc0       1.6.0-4
ii  libkmod2        22-1.1
ii  liblzma5        5.2.2-1.2
ii  libmount1       2.28.2-1
ii  libpam0g        1.1.8-3.3
ii  libseccomp2     2.3.1-2
ii  libselinux1     2.5-3
ii  libsystemd0     231-9
ii  mount           2.28.2-1
ii  util-linux      2.28.2-1

Versions of packages systemd recommends:
ii  dbus            1.10.12-1
ii  libpam-systemd  231-9

Versions of packages systemd suggests:
ii  policykit-1        0.105-16
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  231-9

-- no debconf information