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Bug#853041: general: Blank screen after suspend on acer laptop (only if logged on)

Package: general
Severity: important

Dear Maintainer,

I have a Debian 8 on my laptop since several months now and it worked all fine.

However, since about 2 weeks, the laptop freezes when I suspend a logged-on

My informations :
        - I can successfully do CTR+ALT+F1 after resume, only the display is
        - I tried to uninstall nvidia drivers and backlisting nouveau : nothing
        - It only happens when there is a session logged on. If I logout before
suspend, the computer can resume normally.
        - I tried to suspend both by closing the lid of the laptop and by
pressing ALT while clicking on the shutdown button in the top right corner :
same bug

I don't "hack" with the system a lot. I mostly browse the internet and do a
weekly "apt-get update && install".

Best Regards,

-- System Information:
Debian Release: 8.7
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)