And again about the second monitor from the tablet ...

Being the owner of an average tablet with a non-working sensor (the eldest son tried), he thought for a long time where to adapt. Google, Google and Google ( one , two , Hacker number 227), as well as many other recipes with the participation of spacedesk , iDispla and some others. That's just bad luck - I have Linux. Googling more, I found a few recipes and, through simple shamanism, got an acceptable result.


My way under the cut.

You will need:
')
Linux with installed:

• x11vnc (any tigervnc and others I frankly dislike)
• adb from android-tools kit

Tablet / Smart with debug mode enabled and installed:

• AndroidNVC (I have it, because there is no advertising)
• What kind of screen blanking blocker (I did not find without advertising)
• Any autoloader (run VNC and blocker) is optional (see below for details).

so, we start.

1. Get the Modeline for xorg.conf

$ cvt 1024 768 25 #   gtf,       modeline. 

2. Editing


Restart X-sy and check through arandr. Adjust the location and orientation. It should be something like this:



We save in the file - it is useful to us.

3. Create a file for autoloading in WM / DE (I have planshet.sh)

 x11vnc -rfbport 5900 -display :0 -dontdisconnect -noxfixes -xdamage -shared -forever -clip 1024x768+1600+0 -scale 1024x768 -bg -cursor X -o /home/$USER/x11vnc.log -repeat xrandr --addmode VIRTUAL1 1024x768 #  xrandr --output VIRTUAL1 --mode 1024x768 #  xrandr --output VIRTUAL2 --off --output HDMI1 --off --output VIRTUAL1 --mode 1024x768 --pos 1602x0 --rotate normal --output DP1 --off --output VGA1 --mode 1600x900 --pos 0x0 --rotate normal #       arandr 

Check:

 $ xrandr |grep VIRTUAL1 VIRTUAL1 connected 1024x768+1600+0 (normal left inverted right x axis y axis) 0mm x 0mm 

Since there is no autostart directory in IceWM, but there is a file ~ / .icewm / startup (which should be executable), we add the following to it:

 sh -c /path/to/planshet.sh 

4. Disable blanking monitors:

  xset s off xset s noblank xset -dpms 

And now the fun part! How to get the coordinates of "tapov" for a device without a "trial and error method" tortured keyboard in the console?

For the sake of such a thing, I made a program . If you run it from the console, then we get what we need - the output coordinates of tapes.



6. Let's add all this in planshet.sh


And we will do

 chmod +x /path/to/planshet.sh 

That's all. Reboot the X-server and get a multiskrin.

I have a conky on the “small” one.

Screen dual screen attached.



And I throw datasheet at him when I'm modeling something.

UPD:
An interesting feature was found (checked only in gentoo ). If you start WITHOUT /etc/X11/xorg.conf, then xrandr works quite correctly. And if you create at least a little "wrong" xorg.conf (well, for example, I have Intel's integrashka naughty with the AccelMethod parameter "sna"), we get a refusal to shift the dummy of the screen and an error xrandr. In this case, the connected second monitor via DVI works "like a clock."
So you can safely generate the necessary permissions using xrandr without worrying about the missing Xsorg configuration.