Update:
I've managed to get things working, here is what I've done:
First I've created a file, 90-force-crt.conf in /usr/share/X11/xorg.conf.d with
the following content:
Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration" "on"
Option "IgnoreDisplayDevices" ""
EndSection
This made sure nvidia recognizes a non-existent display even when xorg.conf is
regenerated.
Next, using the built in display manager, I've aligned the displays so the HDMI
display is on the right and the internal display and the non-existent display
are on the left, the internal screen completely overlapping with the virtual
display.
This worked pretty well, but I had to write a small script to set the
resolution of virtual display to match the laptop screen size. The script runs
at login and contains the following:
#!/bin/bash
if prime-select query | grep -q "nvidia"; then
if xrandr | grep -q "HDMI-0 connected"; then
xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112
900 903 908 934 -hsync +vsync
xrandr --addmode VGA-0 "1600x900"
xrandr --output VGA-0 --mode "1600x900"
fi
fi
Now everything works.
I'll attach my xorg.0.log created with the above config.
** Attachment added: "Xorg.0.conf"
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1394665/+attachment/4272037/+files/Xorg.0.log
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https://bugs.launchpad.net/bugs/1394665
Title:
internal display does not show up in nvidia-settings nor in xorg.conf,
making it unusable
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