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copied!<p>You can use <a href="http://linux.die.net/man/3/xrrsetscreenconfigandrate" rel="nofollow">xrrsetscreenconfigandrate</a>, as explained <a href="http://www.opengl.org/wiki/Programming_OpenGL_in_Linux%3a_Changing_the_Screen_Resolution" rel="nofollow">here</a>:</p> <pre><code>#include<stdio.h> #include<stdlib.h> #include<string.h> #include<unistd.h> #include<X11/Xlib.h> #include<X11/extensions/Xrandr.h> Display *dpy; Window root; int num_sizes; XRRScreenSize *xrrs; XRRScreenConfiguration *conf; short possible_frequencies[64][64]; short original_rate; Rotation original_rotation; SizeID original_size_id; int main(int argc, char *argv[]){ // // CONNECT TO X-SERVER, GET ROOT WINDOW ID // dpy = XOpenDisplay(NULL); root = RootWindow(dpy, 0); // // GET POSSIBLE SCREEN RESOLUTIONS // xrrs = XRRSizes(dpy, 0, &num_sizes); // // LOOP THROUGH ALL POSSIBLE RESOLUTIONS, // GETTING THE SELECTABLE DISPLAY FREQUENCIES // for(int i = 0; i < num_sizes; i ++) { short *rates; int num_rates; printf("\n\t%2i : %4i x %4i (%4imm x%4imm ) ", i, xrrs[i].width, xrrs[i].height, xrrs[i].mwidth, xrrs[i].mheight); rates = XRRRates(dpy, 0, i, &num_rates); for(int j = 0; j < num_rates; j ++) { possible_frequencies[i][j] = rates[j]; printf("%4i ", rates[j]); } } printf("\n"); // // GET CURRENT RESOLUTION AND FREQUENCY // conf = XRRGetScreenInfo(dpy, root); original_rate = XRRConfigCurrentRate(conf); original_size_id = XRRConfigCurrentConfiguration(conf, &original_rotation); printf("\n\tCURRENT SIZE ID : %i\n", original_size_id); printf("\tCURRENT ROTATION : %i \n", original_rotation); printf("\tCURRENT RATE : %i Hz\n\n", original_rate); // // CHANGE RESOLUTION // printf("\tCHANGED TO %i x %i PIXELS, %i Hz\n\n", xrrs[1].width, xrrs[1].height, possible_frequencies[1][0]); XRRSetScreenConfigAndRate(dpy, conf, root, 1, RR_Rotate_0, possible_frequencies[1][0], CurrentTime); // // SLEEP A WHILE // usleep(6000000); // // RESTORE ORIGINAL CONFIGURATION // printf("\tRESTORING %i x %i PIXELS, %i Hz\n\n", xrrs[original_size_id].width, xrrs[original_size_id].height, original_rate); XRRSetScreenConfigAndRate(dpy, conf, root, original_size_id, original_rotation, original_rate, CurrentTime); // // EXIT // XCloseDisplay(dpy); } // // gcc -o Xrandr Xrandr.cc -lX11 -lXrandr -lstdc++ // </code></pre>

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