I run this command to allow me to move windows between screens:

xrandr --auto

This magic command fixes my screen for me (before I run this my 2nd monitor is just an empty space where I can move my mouse). How can I make whatever this command does stick when I reboot? I'm more interested in fixing my configuration than just re-running this command, but I'm clueless as to how to make this happen.

I have 2 monitors, DFP 5 and DFP 6. Running xrandr results in this:

DFP1 disconnected (normal left inverted right x axis y axis)

DFP2 disconnected (normal left inverted right x axis y axis)

DFP3 disconnected (normal left inverted right x axis y axis)

DFP4 disconnected (normal left inverted right x axis y axis)

DFP5 connected 1680x1050+1680+0 (normal left inverted right x axis y axis) 474mm x 296mm

   1680x1050      60.0*+

   1400x1050      60.0  

   1280x1024      75.0     60.0  

   1440x900       60.0  

   1280x960       75.0     60.0  

   1280x800       75.0     60.0  

   1152x864       60.0     75.0  

   1280x768       75.0     60.0  

   1280x720       75.0     60.0  

   1024x768       75.0     60.0  

   800x600        75.0     60.3  

   640x480        75.0     59.9  

DFP6 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm

   1680x1050      60.0*+

   1400x1050      60.0  

   1280x1024      75.0     60.0  

   1440x900       60.0  

   1280x960       75.0     60.0  

   1280x800       75.0     60.0  

   1152x864       60.0     75.0  

   1280x768       75.0     60.0  

   1280x720       75.0     60.0  

   1024x768       75.0     60.0  

   800x600        75.0     60.3  

   640x480        75.0     59.9  

CRT1 disconnected (normal left inverted right x axis y axis)

I have already set up DFP 6 to be right of DFP 5 using the Displays menu in debian. Here is my xorg.conf file:

Section "ServerLayout"

        Identifier     "aticonfig Layout"

        Screen      0  "aticonfig-Screen[0]-0" 0 0

EndSection



Section "Module"

EndSection



Section "Monitor"

        Identifier   "aticonfig-Monitor[0]-0"

        Option      "VendorName" "ATI Proprietary Driver"

        Option      "ModelName" "Generic Autodetecting Monitor"

        Option      "DPMS" "true"

EndSection



Section "Device"

        Identifier  "aticonfig-Device[0]-0"

        Driver      "fglrx"

        BusID       "PCI:4:0:0"

EndSection



Section "Screen"

        Identifier "aticonfig-Screen[0]-0"

        Device     "aticonfig-Device[0]-0"

        Monitor    "aticonfig-Monitor[0]-0"

        DefaultDepth     24

        SubSection "Display"

                Viewport   0 0

                Depth     24

                virtual 3360 1050

        EndSubSection

EndSection

It seems to be configured for everything to be one screen, and xrandr --auto somehow fixes it. Is there some way of taking a peek at what this command is doing to save the result to xorg.conf? How do you normally use xrandr to get the results to persist?

If I search for this I either get told to modify my xorg.conf file (which I don't know how to do because I don't know what xrandr --auto is actually doing) or instructions on how to run xrandr on startup, which I'm guessing isn't necessary, but I may be wrong.

Since this is the fglrx driver, you can use the aticonfig command to generate an xorg.conf file. From your xrandr output I'm guessing the command you need is this:

sudo aticonfig --initial=dual-head --screen-layout=left

If this doesn't give you what you want, aticonfig will automatically back up your xorg.conf file (with a .fglrx-x extension), so you can easily restore the original configuration.

If you don't have any luck with aticonfig, there is a GUI tool configuring xorg.conf called amdcccle (should be in the fglrx-control package).

I created the following file:

/etc/X11/Xsession.d/45custom_xrandr-settings and placed this line into it:

xrandr --output DFP6 --primary

This had the effect of making the correct monitor the primary one, and it launches on login.

-xrandr --newmode "2560x1080_60.00"  230.00  2560 2720 2992 3424  1080 1083 1093 1120 -hsync +vsync

-xrandr --addmode HDMI1 "2560x1080_60.00"

-xrandr --output HDMI1 --mode 2560x1080_60.00 --rate 50.0

-xrandr --output eDP1 --mode 1920x1080 --rate 60.0

check xrandr to see your HDMI number and eDP1 (which is my internal screen laptop)
add these lines to sudo gedit /usr/sbin/lightdm-session

#Guide

#Purge xorg, xserver-* nvidia*

#Install online xorg and xserver-xorg

#Install nvidia-settings and nvidia-prime





#gnome-session-properties

#unity --replace

Run it with a boot script.

Part 1:

Create a directory for scripts... this can be anything and anywhere, just remember the location if you deviate so you can substitute it in.

mkdir ~/Scripts

You can use any text editor you are comfortable using for the next part

gedit ~/Scripts/setoutput.sh

Add these to the script
#!/usr/bin/env sh
xrandr --auto

I use "xrandr -s 1440x900"
Save/close the file.
Finish up by running the following commands:

chmod +x ~/Scripts/setoutput.sh

sudo ln -s ~/Scripts/setoutput.sh /etc/X11/Xsession.d/45setoutput

reboot

"reboot" may need replaced with "shutdown -r now"

When the system boots, your settings should have run, making them now persistent as long as the script exists.

Thanks in part to "xenopeek" for their post on Tue Nov 01, 2011 7:02 am at Linuxmint which provided directions for doing this with "xrandr --output VGA-0 --primary". Same base concept/script even if the command changed slightly.