<HTML><BODY>Hi all. I need to run some-program which makes screen capturing via xlib library in separate xserver session. So, I start my ubuntu 14 and `origin` xserver session (lets call it this way) starts. After that I run startx some-program After running this command a black screen appears and on this black screen I see my program and it works as expected. That's ok - this is what I need. However, firstly I want to continue using my computer and secondly I must run N such programs in N separate xserver sessions. The problem is that when I try to return to my `origin` session by pressing ctrl+alt+f7 some-program continues working however, its screen captures become simple black rectangles (no any content). This is my code of some-program using which I capture screen: Display* display = XOpenDisplay(NULL); Window root = DefaultRootWindow(display); XWindowAttributes attributes = {0}; XGetWindowAttributes(display, root, &attributes); int width, height; width = attributes.width; height = attributes.height; XImage* img = XGetImage(display, root, 0, 0 , width, height, AllPlanes, ZPixmap); ... XDestroyImage(img); Could anyone say what should I do in order to capture screen in separate xserver session while it is not active (the user is using another xsession). -- Alex Sviridov</BODY></HTML>