https://bugs.kde.org/show_bug.cgi?id=429048
Bug ID: 429048
Summary: "Virtual" external monitors not taken into account
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 133287
--> https://bugs.kde.org/attachment.cgi?id=133287&action=edit
script to setup virtual screen
I use xrandr to set up a virtual monitor, which I can then access via VNC on
android tablet and use as a second monitor. This can be done over USB for
relatively good performance.
Some xorg drivers include natively the possibility to add virtual outputs, for
example the old xf86-intel driver and the amd driver. In this case, there is
absolutely no problem, Kde detects everything, and one can configure xinerama
from systemsettings5.
On the other hand, the moder intel "modesettings" driver and the nvidia driver
do not provide this capability. It is still possible to add virtual monitors by
adding a modeline with xrandr to a real but disconnected output, i.e. add the
monitor as HDMI-2 even though there is nothing plugged into HDMI-2. Otherwise,
one can use the evdi driver to add a fake external card.
This works fine, one can export the virtual monitor with any vnc server and one
can move windows to it. It also appears correctly in fullscreen screenshots
when using xinerama. But the "virtual" monitor will always appear as
"disconnected" on xrandr. As a consequence, KDE will not show it in
systemsetting5, and not set a desktop background for it (it will stay black).
I've attached a script to set up this virtual monitor. It uses ADB (android
debug bridge) to connect via USB, but this is optional and won't be used if ADB
is not found. In this can one can simply connect via local network
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