Framerate drops when connecting HDMI display on lubuntu 14.04 ->related to ofGetScreenWith()

@jamet wrote:

hi all,

i discovered a strange latency in my app when connecting an hdmi monitor to my laptop.

after a bit of research, it turns out to be related with ofGetScreenWidth and ofGetScreenHeight, when i comment the call to this two function, the problem disapear.

if i make a test app who only calls this two methods and ofGetFrameRate, the problem is still appearing, at the moment i connect the hdmi monitor, framerate drops from 60 FPS (fixed) to 1-6 FPS.
i made those test with a clone from github master on the 1st of june.

main.cpp :

#include "ofMain.h"
#include "ofApp.h"
#include "GuiApp.h"
#include "ofAppGLFWWindow.h"
int main( ){
	ofAppGLFWWindow window;
window.setMultiDisplayFullscreen(true);
ofSetupOpenGL(&window,1024,768,OF_WINDOW);			// <-------- setup the GL context
ofRunApp(new ofApp());
}

ofApp.cpp :

#include "ofApp.h"
#include "ofVideoGrabber.h"
void ofApp::setup(){
    ofSetFrameRate(60);
}
void ofApp::draw(){
	ofDrawBitmapString("FPS: " + ofToString(int(ofGetFrameRate())),20,ofGetHeight()-40);
float screenFactorX = (ofGetWidth()/(float)ofGetScreenWidth());
    float screenFactorY = (ofGetHeight()/(float)ofGetScreenHeight());

}

strange isn'it?

stranger is that ofGetScreenWidth() and ofGetScreenHeight() always return the same value even if my hdmi display is connected (should be 2* 1980*1080).

does anyone have an idea of how i can get this to work?

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