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/* dpms.c --- syncing the X Display Power Management System values
* xscreensaver, Copyright © 2001-2021 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include "xscreensaver.h"
#ifndef HAVE_DPMS_EXTENSION /* almost the whole file */
void
sync_server_dpms_settings (Display *dpy, struct saver_preferences *p)
{
if (p->verbose_p)
fprintf (stderr, "%s: DPMS not supported at compile time\n", blurb());
}
Bool monitor_powered_on_p (Display *dpy) { return True; }
void monitor_power_on (saver_info *si, Bool on_p) { return; }
#else /* HAVE_DPMS_EXTENSION -- whole file */
# include <X11/Xproto.h>
# include <X11/extensions/dpms.h>
static Bool error_handler_hit_p = False;
static int
ignore_all_errors_ehandler (Display *dpy, XErrorEvent *error)
{
error_handler_hit_p = True;
return 0;
}
void
sync_server_dpms_settings (Display *dpy, struct saver_preferences *p)
{
int event = 0, error = 0;
BOOL o_enabled = False;
CARD16 o_power = 0;
CARD16 o_standby = 0, o_suspend = 0, o_off = 0;
Bool bogus_p = False;
Bool enabled_p = (p->dpms_enabled_p && p->mode != DONT_BLANK);
Bool dpms_quickoff_p = p->dpms_quickoff_p;
int standby_secs = p->dpms_standby / 1000;
int suspend_secs = p->dpms_suspend / 1000;
int off_secs = p->dpms_off / 1000;
Bool verbose_p = p->verbose_p;
static Bool warned_p = False;
/* If the monitor is currently powered off, defer any changes until
we are next called while it is powered on. */
if (! monitor_powered_on_p (dpy))
return;
/* Why did I do this? It makes DPMS never happen.
XSetScreenSaver (dpy, 0, 0, 0, 0);
XForceScreenSaver (dpy, ScreenSaverReset);
*/
if (dpms_quickoff_p && !off_secs)
{
/* To do this, we might need to temporarily re-enable DPMS first. */
off_secs = 0xFFFF;
}
if (standby_secs == 0 && suspend_secs == 0 && off_secs == 0)
/* all zero implies "DPMS disabled" */
enabled_p = False;
else if ((standby_secs != 0 && standby_secs < 10) ||
(suspend_secs != 0 && suspend_secs < 10) ||
(off_secs != 0 && off_secs < 10))
/* any negative, or any positive-and-less-than-10-seconds, is crazy. */
bogus_p = True;
if (bogus_p) enabled_p = False;
/* X protocol sends these values in a CARD16, so truncate them to 16 bits.
This means that the maximum timeout is 18:12:15.
*/
if (standby_secs > 0xFFFF) standby_secs = 0xFFFF;
if (suspend_secs > 0xFFFF) suspend_secs = 0xFFFF;
if (off_secs > 0xFFFF) off_secs = 0xFFFF;
if (! DPMSQueryExtension (dpy, &event, &error))
{
if (verbose_p && !warned_p)
fprintf (stderr, "%s: XDPMS extension not supported\n", blurb());
warned_p = True;
return;
}
if (! DPMSCapable (dpy))
{
if (verbose_p && !warned_p)
fprintf (stderr, "%s: DPMS not supported\n", blurb());
warned_p = True;
return;
}
if (! DPMSInfo (dpy, &o_power, &o_enabled))
{
if (verbose_p && !warned_p)
fprintf (stderr, "%s: unable to get DPMS state\n", blurb());
warned_p = True;
return;
}
if (o_enabled != enabled_p)
{
if (! (enabled_p ? DPMSEnable (dpy) : DPMSDisable (dpy)))
{
if (verbose_p && !warned_p)
fprintf (stderr, "%s: unable to set DPMS state\n", blurb());
warned_p = True;
return;
}
else if (verbose_p)
fprintf (stderr, "%s: turned DPMS %s\n", blurb(),
enabled_p ? "on" : "off");
}
if (bogus_p)
{
if (verbose_p)
fprintf (stderr, "%s: not setting bogus DPMS timeouts: %d %d %d\n",
blurb(), standby_secs, suspend_secs, off_secs);
return;
}
if (!DPMSGetTimeouts (dpy, &o_standby, &o_suspend, &o_off))
{
if (verbose_p)
fprintf (stderr, "%s: unable to get DPMS timeouts\n", blurb());
return;
}
if (o_standby != standby_secs ||
o_suspend != suspend_secs ||
o_off != off_secs)
{
if (!DPMSSetTimeouts (dpy, standby_secs, suspend_secs, off_secs))
{
if (verbose_p)
fprintf (stderr, "%s: unable to set DPMS timeouts\n", blurb());
return;
}
else if (verbose_p)
fprintf (stderr, "%s: set DPMS timeouts: %d %d %d\n", blurb(),
standby_secs, suspend_secs, off_secs);
}
}
Bool
monitor_powered_on_p (Display *dpy)
{
Bool result;
int event_number, error_number;
BOOL onoff = False;
CARD16 state;
if (!DPMSQueryExtension(dpy, &event_number, &error_number))
/* Server doesn't know -- assume the monitor is on. */
result = True;
else if (!DPMSCapable(dpy))
/* Server says the monitor doesn't do power management -- so it's on. */
result = True;
else
{
DPMSInfo(dpy, &state, &onoff);
if (!onoff)
/* Server says DPMS is disabled -- so the monitor is on. */
result = True;
else
switch (state) {
case DPMSModeOn: result = True; break; /* really on */
case DPMSModeStandby: result = False; break; /* kinda off */
case DPMSModeSuspend: result = False; break; /* pretty off */
case DPMSModeOff: result = False; break; /* really off */
default: result = True; break; /* protocol error? */
}
}
return result;
}
void
monitor_power_on (saver_info *si, Bool on_p)
{
if ((!!on_p) != monitor_powered_on_p (si->dpy))
{
XErrorHandler old_handler;
int event_number, error_number;
static Bool warned_p = False;
if (!DPMSQueryExtension(si->dpy, &event_number, &error_number) ||
!DPMSCapable(si->dpy))
{
if (si->prefs.verbose_p && !warned_p)
fprintf (stderr,
"%s: unable to power %s monitor: no DPMS extension\n",
blurb(), (on_p ? "on" : "off"));
warned_p = True;
return;
}
/* The manual for DPMSForceLevel() says that it throws BadMatch if
"DPMS is disabled on the specified display."
The manual for DPMSCapable() says that it "returns True if the X
server is capable of DPMS."
Apparently they consider "capable of DPMS" and "DPMS is enabled"
to be different things, and so even if DPMSCapable() returns
True, DPMSForceLevel() *might* throw an X Error. Isn't that
just fucking special.
*/
XSync (si->dpy, False);
error_handler_hit_p = False;
old_handler = XSetErrorHandler (ignore_all_errors_ehandler);
XSync (si->dpy, False);
DPMSForceLevel(si->dpy, (on_p ? DPMSModeOn : DPMSModeOff));
XSync (si->dpy, False);
XSetErrorHandler (old_handler);
/* Ignore error_handler_hit_p, just probe monitor instead */
if ((!!on_p) != monitor_powered_on_p (si->dpy)) /* double-check */
fprintf (stderr,
"%s: DPMSForceLevel(dpy, %s) did not change monitor power state\n",
blurb(),
(on_p ? "DPMSModeOn" : "DPMSModeOff"));
}
}
#endif /* HAVE_DPMS_EXTENSION -- whole file */
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