Is there a way to force xrandr to re-read current available display modes?

[aivils at latnet.lv]

Hi,
My simple script

#!/bin/bash

IN="LVDS1"
EXT="VGA1"

case "$1" in
     on)
         xrandr --output $IN --off --output $EXT --auto
         ;;
     1440)
         xrandr --output $IN --off --output $EXT --mode 1440x900
         ;;
     1280)
         xrandr --output $IN --off --output $EXT --mode 1280x1024
         ;;
     off)
         xrandr --output $EXT --off --output $IN --auto
         ;;
     *)
         echo "Usage: $0 {on/off}\n"
         exit 2
esac


Said, at work display is 1280x1024
You did:
vga on
You go at home where display is 1440x900
vga 1440
You go back to work
vga 1280
You go to cafee
vga off

Łukasz Maśko @ 2015-05-08 13:23 rakstīja:
> Hello.
> I have a Dell laptop, for which I have 2 docking stations (at home and 
> at
> work), both with additional monitor connected. The monitors differ in
> resolution. I do not turn my laptop off, I only suspend it to RAM, when 
> it is
> not used.
> Let's consider such scenario: laptop is docked at home. Xrandr shows 
> available
> resolution for external screen properly. I turn off the external output
> (xrandr --output VGA1 --off), then I suspend it, undock and take to 
> work,
> where I dock again to another docking port and wake it up.
> The problem is, that the laptop does not re-read the resolution 
> configuration
> then. it shows resolutions from the monitor which I have at home, not 
> at work.
> I think that after the machine wakes up, it gets no "display changed" 
> message,
> which is pretty logical. ButThen The only way I can have the data 
> "fixed" is
> to unplug the monitor physically and plug it back. And I dont like such
> solution, that's not what docking station is for.
> 
> Can I somehow make xrandr refresh its readings?