[Xfce-bugs] [Bug 15446] New: Screens won't turn on after waking up the system from suspension

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=15446

            Bug ID: 15446
           Summary: Screens won't turn on after waking up the system from
                    suspension
    Classification: Xfce Core
           Product: Xfce4-session
           Version: Unspecified
          Hardware: PC (x86_64)
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: General
          Assignee: xfce-bugs at xfce.org
          Reporter: leozinho29_eu at hotmail.com
  Target Milestone: Xfce 4.14

When I suspend the computer, on wake up the screens do not turn on. To make the
screens work again, I have to change to the TTY1 and then to the graphical
session (which is the TTY7 on my system) then the light-locker appears and
redirects me to the LightDM login screen.

I suspect that something inside Xfce (my guess is Xfce4-session) is turning off
the screens just before the suspension and then the Xorg session from LightDM
is unable to find a valid screen. It's noticeable as it's possible to access a
TTY, set the DISPLAY variable and use xrandr to shows the screen status: no
resolution is set, as if something on Xfce unset the displays.

Using GNOME with LightDM or GDM, this problem does not happen.

Computer model: Lenovo Ideapad 310-14ISK
OS: Xubuntu 19.04 using Xubuntu-dev PPA
Xfce version: 4.14pre1
CPU: Intel Core i3-6100U
GPU: Intel HD Graphics 520
RAM: 8 GB
Monitor connections affected: eDP and internal DP (external VGA)

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