My new laptop has the ability to support up to 3 concurrent displays. I
have found that this is actually a problem when I try to use it in my
home office, where the (closed) laptop is placed into a docking station
that is connected to two external displays.
The default X behavior is to use both external displays *and* the built-
in display. Of course, the KDM login fields end up on the invisible
I can't use a static X configuration to work around this problem,
because there are plenty of times that I'll want to use the built-in
display. I need to do this:
if /usr/bin/grep -q closed /proc/acpi/button/lid/LID/state; then
/sys/class/drm/card0-*/status | /usr/bin/wc -l`
[ $NUM_DISPLAYS -gt 1 ] && /usr/bin/xrandr --output LVDS1 --off
(This disables the built-in display when the laptop is closed *and*
there is at least one external display connected.)
In theory I should be able to add this to /etc/kde/kdm/Xsetup, but it
seems that kdm_greet is already running when this script is executed, so
the theme geometry gets all messed up. (My external displays do not
have the same resolution as the built-in display.)
For now, I've replaced /usr/libexec/kde4/kdm_greet with a wrapper script
that does the xrandr stuff and then runs the actual program. This is
obviously fragile, however.
Can anyone think of a better way to do this?
Ian Pilcher arequipeno(a)gmail.com
Sometimes there's nothing left to do but crash and burn...or die trying.