KDM: run xrandr *before* kdm_greet

[Orion Poplawski]

On 04/19/2013 10:55 PM, Orion Poplawski wrote:
> On 04/19/2013 11:16 AM, Ian Pilcher wrote:
>> 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
>> built-in display.
>>
>> 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
>>        NUM_DISPLAYS=`/usr/bin/grep ^connected$
>> /sys/class/drm/card0-*/status | /usr/bin/wc -l`
>>        [ $NUM_DISPLAYS -gt 1 ] && /usr/bin/xrandr --output LVDS1 --off
>>    fi
>>
>> (This disables the built-in display when the laptop is closed *and*
>> there is at least one external display connected.)
>>
>> In theory I should be able to add this to /etc/kde/kdm/Xsetup, but it
>> seems that kdm_greet is already running when this script is executed, so
>> the theme geometry gets all messed up.  (My external displays do not
>> have the same resolution as the built-in display.)
>>
>> For now, I've replaced /usr/libexec/kde4/kdm_greet with a wrapper script
>> that does the xrandr stuff and then runs the actual program.  This is
>> obviously fragile, however.
>>
>> Can anyone think of a better way to do this?
>>
>> Thanks!
>>
>
> I currently install the following as /etc/X11/xinit/xinitrc.d/nolvds.sh
>
> #!/bin/sh
> # Disable LVDS if another output is up
> if xrandr --current | grep -qE '^(DVI|VGA).* connected'
> then
>     lvds=$(xrandr --current | awk '$1 ~ /LVDS/ { print $1 }')
>     xrandr --output $lvds --off
> fi
>

Of course just after sending this I realized that this is what runs 
*after* login as well.  My work around to get the login window onto the 
proper screen has been to set GreeterScreen as needed in /etc/kde/kdm/kdmrc.


-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion at cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com