Good evening.
I have a dual monitor setup and am trying to figure out why ScreenCount
returns 1. My code is as follows:
/**
* Compiles with:
* g++ -std=c++11 queryx11.cpp -lX11 -o queryx11
*/
#include <iostream>
#include <memory>
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>
int main(void) {
auto display = std::unique_ptr<Display, int(*)(Display*)>(
XOpenDisplay(NULL),
XCloseDisplay
);
if (!display) {
std::cerr << "Cannot open display" << std::endl;
return 1;
}
std::cout << "ScreenCount returns: " << ScreenCount(display.get())
<< std::endl;
std::cout << "DisplayString returns: " <<
DisplayString(display.get()) << std::endl;
std::cout << "DefaultScreen returns: " <<
DefaultScreen(display.get()) << std::endl;
return 0;
}
This returns:
ScreenCount returns: 1
DisplayString returns: :0
DefaultScreen returns: 0
In my Xorg.0.log, the following lines are shown:
[ 4.397] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 4.398] (==) No Layout section. Using the first Screen section.
[ 4.398] (==) No screen section available. Using defaults.
[ 4.398] (**) |-->Screen "Default Screen Section" (0)
[ 4.398] (**) | |-->Monitor "<default monitor>"
[ 4.399] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 4.399] (==) Automatically adding devices
[ 4.399] (==) Automatically enabling devices
[ 4.399] (==) Automatically adding GPU devices
FWIW I'm using Xrandr, and I've tried doing "xrandr --auto" just to see
what it detects and I still get the same result. I'm completely lost at
this point and would appreciate any help.
Thank you for your time.
-TJ
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