Oh, sorry for sending it twice.
See the test program in the attachment.
It can be compiled by gcc -o dpmsnotify dpmsnotify.c -lxcb -lxcb-dpms
#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
#include <xcb/dpms.h>
int main()
{
xcb_connection_t *c;
xcb_generic_event_t *e;
/* Open the connection to the X server */
c = xcb_connect (NULL, NULL);
const struct xcb_query_extension_reply_t *dpms = xcb_get_extension_data(c, &xcb_dpms_id);
fprintf(stdout, "dpms present %d\n", dpms->present);
xcb_dpms_get_version_cookie_t version_cookie = xcb_dpms_get_version(c, XCB_DPMS_MAJOR_VERSION, XCB_DPMS_MINOR_VERSION);
xcb_dpms_get_version_reply_t *version_reply = xcb_dpms_get_version_reply(c, version_cookie, NULL);
fprintf(stdout, "dpms version %d.%d\n", version_reply->server_major_version, version_reply->server_minor_version);
free(version_reply);
xcb_dpms_select_input(c, XCB_DPMS_EVENT_MASK_INFO_NOTIFY);
xcb_flush (c);
while ((e = xcb_wait_for_event (c))) {
uint8_t response_type = e->response_type & ~0x80;
if (response_type == dpms->first_event + XCB_DPMS_INFO_NOTIFY) {
xcb_dpms_info_notify_event_t *info = (xcb_dpms_info_notify_event_t *)e;
fprintf(stdout, "dpms state %d, power level %d\n", info->state, info->power_level);
}
free (e);
}
return 0;
}
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