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Stretch: Greeter powers down and locks monitors

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Hi, I'm running stretch with Xfce.  Gnome is also installed.  The login 
greeter appears correctly, and allows login, but if I leave the "greeter" 
screen too long, then something intervenes and puts the two monitors into 
a sleep mode (iiyama E1700S orange light).  I cannot find any key 
combination which wakes up gdm3.

Command « inxi -GS » reports:

  System:    Host: maria Kernel: 4.9.0-4-amd64 x86_64 (64 bit) Desktop:
             Xfce 4.12.3 Distro: Debian GNU/Linux 9 (stretch)
  Graphics:  Card: NVIDIA G72 [GeForce 7300 LE]
             Display Server: X.Org 1.19.2 driver: N/A   (nouveau)
             Resolution: 1280x1024@60.02hz, 1280x1024@60.02hz
             GLX Renderer: Gallium 0.4 on NV46 GLX Version: 2.1 Mesa 13.0.6

Command « xrandr » reports

  Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 4096 x 4096
  VGA-1 connected primary 1280x1024+0+0 (normal left inverted right x axis
        y axis) 338mm x 270mm
        1280x1024     60.02*+  75.02
  DVI-I-1 connected 1280x1024+1280+0 (normal left inverted right x axis y
        axis) 338mm x 270mm
        1280x1024     60.02*+  75.02

xscreensaver 5.36-1 and light-locker 1.7.0-3 are both present but not 
running.

Command « ps -elf | grep gdm3 » reports

  4 S root       746     1  0  80   0 - 73899 SyS_po 11:36 ?        00:00:00 /usr/sbin/gdm3
  4 S Debian-+   777   756  0  80   0 - 47229 SyS_po 11:36 tty1     00:00:00
                          /usr/lib/gdm3/gdm-wayland-session gnome-session --autostart
                          /usr/share/gdm/greeter/autostart

Is there some way of either inhibiting the screensaver action or 
recovering the greeter screen?  My current workaround when this happens is 
to log in via ssh and then as root run command « systemctl restart 
gdm3.service ».

Roger

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Stretch: Greeter powers down and locks monitors Roger Price <debian@rogerprice.org> - 2017-12-20 12:00 +0100
  Re: Stretch: Greeter powers down and locks monitors Thomas Amm <debili@open-email.net> - 2017-12-20 15:50 +0100
    Re: Stretch: Greeter powers down and locks monitors Roger Price <debian@rogerprice.org> - 2017-12-21 13:10 +0100
  Re: Stretch: Greeter powers down and locks monitors David Christensen <dpchrist@holgerdanske.com> - 2017-12-20 16:40 +0100
    Re: Stretch: Greeter powers down and locks monitors Roger Price <debian@rogerprice.org> - 2017-12-21 13:30 +0100
      Re: Stretch: Greeter powers down and locks monitors David Christensen <dpchrist@holgerdanske.com> - 2017-12-21 19:50 +0100

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