Question about hotplugging

Mark van Rossum Mark.vanRossum at
Tue Aug 28 15:55:32 UTC 2018

On my laptop I use Xorg with the intel driver on Debian.

When I hotplug my 2560x1600 monitor, the desktop switches to that monitor.
When I hotplug my 2560x1440 monitor, the desktop gets extended.

Xorg (==) intel(0): Display hotplug detection enabled
/usr/lib/gdm3/gdm-x-session: (II) intel(0): resizing framebuffer to 
/usr/lib/gdm3/gdm-x-session[2975]: (II) intel(0): switch to mode 
2560x1600 at 59.9 on DP1 using pipe 0, position (0, 0), rotation normal, 
reflection none

However, when I plug in a 2560x1440:
gdm-x-session[1788]: (II) intel(0): resizing framebuffer to 4480x1440
gdm-x-session[1788]: (II) intel(0): switch to mode 2560x1440 at 60.0 on DP1 
using pipe 1, position (1920, 0), rotation normal, reflection none

This latter behaviour is not desired as it leads to occasional crashed.

- who does the mode-switching? (Xorg, driver, xinerama, gdm?)

- how can I change the behaviour, so that when I hotplug the 2560x1440 
monitor, the framebuffer becomes 2560x1440 and not 4480x1440


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