[SOLVED] Possible to move KDM login window to other display?

The_Dark_Passenger · 08-16-2018, 01:42 AM

Hello,

I have Slackware64 -current running KDE 4.14.38 installed on my desktop that has two monitors attached. The KDM login credential window is displaying on my secondary display instead of my primary one. Is there anyway to select which display I want the KDM login window shown on?

Any help would be greatly appreciated!

phenixia2003 · 08-16-2018, 02:58 AM

Hello,

As root, open /etc/kde/kdm/kdmrc, then in section [X-*-Greeter], search for key GreeterScreen. It should be commented and set to -1 by default. Uncomment it, set it to 1 and restart X.

Note that in some case (ex: reset of X), the greeter can be displayed on the wrong screen even with this setting. To fix that, the best solution is to set GreeterScreen to -1 or to simply comment it, then create a file 10-monitors.conf in /etc/X11/xorg.conf.d/ with a content like as below :

Code:

Section "Monitor"
  Identifier "<ID-OF-PRIMARY-MONITORY>"
  Option "Primary" "true"
EndSection

Section "Monitor"
  Identifier "<ID-OF-SECONDARY-MONITORY>"
  Option "RightOf" "<ID-OF-PRIMARY-MONITORY>"
EndSection

Attention, do not forget to change the identifiers <ID-OF-PRIMARY-MONITORY> and <ID-OF-SECONDARY-MONITORY> to match the identifiers of your monitors. You'll find them by running xrandr -q (in bold in example below) :

Code:

Screen 0: minimum 8 x 8, current 3200 x 1080, maximum 16384 x 16384
VGA-0 connected 1280x1024+1920+0 (normal left inverted right x axis y axis) 338mm x 270mm
   1280x1024     60.02*+  75.02  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   640x480       75.00    72.81    59.94  
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1280x1024     60.02  
   1280x960      60.00  
   1280x720      60.00  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
HDMI-0 disconnected (normal left inverted right x axis y axis)

Note that in some case, in might be required to add, in /etc/X11/xorg.conf.d/10-monitors.conf, section(s) like as below to force the monitor(s) to use the native resolution by default :

Code:

Section "Screen"
  Identifier "Primary-Screen"
  Monitor "<ID-OF-MONITOR>"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "<NATIVE_RESOLUTION>" "<ALTERNATE_RESOLUTION>" ...
  EndSubSection
EndSection

Attention, do not forget to change the identifiers <ID-OF-MONITOR> to match the identifier(s) of your monitor(s), and <NATIVE_RESOLUTION/ALTERNATE_RESOLUTION> to mach the right resolutions.

For instance, one of my Slackware computer has the following configuration :

Code:

# This configuration defines the display *LG W2242S* (on VGA1)
# as primary monitor with integrated LCD display (on LVDS1) on
# the right.
#
# The section 'Screen' ensures that monitor *LG W2242S* always use
# its native resolution by default. In case this monitor is replaced
# by another, this section will have to be modified accordingly.

Section "Monitor"
  Identifier "VGA1"
  Option "Primary" "true"
EndSection

Section "Monitor"
  Identifier "LVDS1"
  Option "RightOf" "VGA1"
EndSection


Section "Screen"
  Identifier "Primary-Screen"
  Monitor "VGA1"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "1680x1050" "1280x1024"  "1152x864" "1024x768" "800x600"
  EndSubSection
EndSection

Hope this helps.

--
SeB

The_Dark_Passenger · 08-16-2018, 03:30 AM

After adapting your 10-monitors.conf file to fit my system, and in my case changing the GreeterScreen key to be -1, the greeter and login animation are now properly displayed on my primary monitor! Thank you so much for helping solve this, phenixia2003!