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xserver/hw/xfree86/modes/xf86EdidModes.c

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/*
* Copyright 2006 Luc Verhaegen.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* @file This file covers code to convert a xf86MonPtr containing EDID-probed
* information into a list of modes, including applying monitor-specific
* quirks to fix broken EDID data.
*/
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#else
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#endif
#include "xf86.h"
#include "xf86DDC.h"
#include <X11/Xatom.h>
#include "property.h"
#include "propertyst.h"
#include "xf86DDC.h"
#include "xf86Crtc.h"
#include <string.h>
#include <math.h>
/*
* Quirks to work around broken EDID data from various monitors.
*/
typedef enum {
DDC_QUIRK_NONE = 0,
/* First detailed mode is bogus, prefer largest mode at 60hz */
DDC_QUIRK_PREFER_LARGE_60 = 1 << 0,
/* 135MHz clock is too high, drop a bit */
DDC_QUIRK_135_CLOCK_TOO_HIGH = 1 << 1,
/* Prefer the largest mode at 75 Hz */
DDC_QUIRK_PREFER_LARGE_75 = 1 << 2,
/* Convert detailed timing's horizontal from units of cm to mm */
DDC_QUIRK_DETAILED_H_IN_CM = 1 << 3,
/* Convert detailed timing's vertical from units of cm to mm */
DDC_QUIRK_DETAILED_V_IN_CM = 1 << 4,
/* Detailed timing descriptors have bogus size values, so just take the
* maximum size and use that.
*/
DDC_QUIRK_DETAILED_USE_MAXIMUM_SIZE = 1 << 5,
/* Monitor forgot to set the first detailed is preferred bit. */
DDC_QUIRK_FIRST_DETAILED_PREFERRED = 1 << 6,
} ddc_quirk_t;
static Bool quirk_prefer_large_60 (int scrnIndex, xf86MonPtr DDC)
{
/* Belinea 10 15 55 */
if (memcmp (DDC->vendor.name, "MAX", 4) == 0 &&
((DDC->vendor.prod_id == 1516) ||
(DDC->vendor.prod_id == 0x77e)))
return TRUE;
/* Acer AL1706 */
if (memcmp (DDC->vendor.name, "ACR", 4) == 0 &&
DDC->vendor.prod_id == 44358)
return TRUE;
/* Bug #10814: Samsung SyncMaster 225BW */
if (memcmp (DDC->vendor.name, "SAM", 4) == 0 &&
DDC->vendor.prod_id == 596)
return TRUE;
/* Bug #10545: Samsung SyncMaster 226BW */
if (memcmp (DDC->vendor.name, "SAM", 4) == 0 &&
DDC->vendor.prod_id == 638)
return TRUE;
return FALSE;
}
static Bool quirk_prefer_large_75 (int scrnIndex, xf86MonPtr DDC)
{
/* Bug #11603: Funai Electronics PM36B */
if (memcmp (DDC->vendor.name, "FCM", 4) == 0 &&
DDC->vendor.prod_id == 13600)
return TRUE;
return FALSE;
}
static Bool quirk_detailed_h_in_cm (int scrnIndex, xf86MonPtr DDC)
{
/* Bug #10304: "LGPhilipsLCD LP154W01-A5" */
/* Bug #12784: "LGPhilipsLCD LP154W01-TLA2" */
if (memcmp (DDC->vendor.name, "LPL", 4) == 0 &&
DDC->vendor.prod_id == 0)
return TRUE;
/* Bug #11603: Funai Electronics PM36B */
if (memcmp (DDC->vendor.name, "FCM", 4) == 0 &&
DDC->vendor.prod_id == 13600)
return TRUE;
return FALSE;
}
static Bool quirk_detailed_v_in_cm (int scrnIndex, xf86MonPtr DDC)
{
/* Bug #11603: Funai Electronics PM36B */
if (memcmp (DDC->vendor.name, "FCM", 4) == 0 &&
DDC->vendor.prod_id == 13600)
return TRUE;
return FALSE;
}
static Bool quirk_detailed_use_maximum_size (int scrnIndex, xf86MonPtr DDC)
{
/* Bug #10304: LGPhilipsLCD LP154W01-A5 */
if (memcmp (DDC->vendor.name, "LPL", 4) == 0 &&
DDC->vendor.prod_id == 0)
return TRUE;
return FALSE;
}
static Bool quirk_135_clock_too_high (int scrnIndex, xf86MonPtr DDC)
{
/* Envision Peripherals, Inc. EN-7100e. See bug #9550. */
if (memcmp (DDC->vendor.name, "EPI", 4) == 0 &&
DDC->vendor.prod_id == 59264)
return TRUE;
return FALSE;
}
static Bool quirk_first_detailed_preferred (int scrnIndex, xf86MonPtr DDC)
{
/* Philips 107p5 CRT. Reported on xorg@ with pastebin. */
if (memcmp (DDC->vendor.name, "PHL", 4) == 0 &&
DDC->vendor.prod_id == 57364)
return TRUE;
return FALSE;
}
typedef struct {
Bool (*detect) (int scrnIndex, xf86MonPtr DDC);
ddc_quirk_t quirk;
char *description;
} ddc_quirk_map_t;
static const ddc_quirk_map_t ddc_quirks[] = {
{
quirk_prefer_large_60, DDC_QUIRK_PREFER_LARGE_60,
"Detailed timing is not preferred, use largest mode at 60Hz"
},
{
quirk_135_clock_too_high, DDC_QUIRK_135_CLOCK_TOO_HIGH,
"Recommended 135MHz pixel clock is too high"
},
{
quirk_prefer_large_75, DDC_QUIRK_PREFER_LARGE_75,
"Detailed timing is not preferred, use largest mode at 75Hz"
},
{
quirk_detailed_h_in_cm, DDC_QUIRK_DETAILED_H_IN_CM,
"Detailed timings give horizontal size in cm."
},
{
quirk_detailed_v_in_cm, DDC_QUIRK_DETAILED_V_IN_CM,
"Detailed timings give vertical size in cm."
},
{
quirk_detailed_use_maximum_size, DDC_QUIRK_DETAILED_USE_MAXIMUM_SIZE,
"Detailed timings give sizes in cm."
},
{
quirk_first_detailed_preferred, DDC_QUIRK_FIRST_DETAILED_PREFERRED,
"First detailed timing was not marked as preferred."
},
{
NULL, DDC_QUIRK_NONE,
"No known quirks"
},
};
/*
* TODO:
* - for those with access to the VESA DMT standard; review please.
*/
#define MODEPREFIX(name) NULL, NULL, name, 0,M_T_DRIVER
#define MODESUFFIX 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,FALSE,FALSE,0,NULL,0,0.0,0.0
static DisplayModeRec DDCEstablishedModes[17] = {
{ MODEPREFIX("800x600"), 40000, 800, 840, 968, 1056, 0, 600, 601, 605, 628, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 800x600@60Hz */
{ MODEPREFIX("800x600"), 36000, 800, 824, 896, 1024, 0, 600, 601, 603, 625, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 800x600@56Hz */
{ MODEPREFIX("640x480"), 31500, 640, 656, 720, 840, 0, 480, 481, 484, 500, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 640x480@75Hz */
{ MODEPREFIX("640x480"), 31500, 640, 664, 704, 832, 0, 480, 489, 491, 520, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 640x480@72Hz */
{ MODEPREFIX("640x480"), 30240, 640, 704, 768, 864, 0, 480, 483, 486, 525, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 640x480@67Hz */
{ MODEPREFIX("640x480"), 25200, 640, 656, 752, 800, 0, 480, 490, 492, 525, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 640x480@60Hz */
{ MODEPREFIX("720x400"), 35500, 720, 738, 846, 900, 0, 400, 421, 423, 449, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 720x400@88Hz */
{ MODEPREFIX("720x400"), 28320, 720, 738, 846, 900, 0, 400, 412, 414, 449, 0, V_NHSYNC | V_PVSYNC, MODESUFFIX }, /* 720x400@70Hz */
{ MODEPREFIX("1280x1024"), 135000, 1280, 1296, 1440, 1688, 0, 1024, 1025, 1028, 1066, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 1280x1024@75Hz */
{ MODEPREFIX("1024x768"), 78800, 1024, 1040, 1136, 1312, 0, 768, 769, 772, 800, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 1024x768@75Hz */
{ MODEPREFIX("1024x768"), 75000, 1024, 1048, 1184, 1328, 0, 768, 771, 777, 806, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 1024x768@70Hz */
{ MODEPREFIX("1024x768"), 65000, 1024, 1048, 1184, 1344, 0, 768, 771, 777, 806, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 1024x768@60Hz */
{ MODEPREFIX("1024x768"), 44900, 1024, 1032, 1208, 1264, 0, 768, 768, 776, 817, 0, V_PHSYNC | V_PVSYNC | V_INTERLACE, MODESUFFIX }, /* 1024x768@43Hz */
{ MODEPREFIX("832x624"), 57284, 832, 864, 928, 1152, 0, 624, 625, 628, 667, 0, V_NHSYNC | V_NVSYNC, MODESUFFIX }, /* 832x624@75Hz */
{ MODEPREFIX("800x600"), 49500, 800, 816, 896, 1056, 0, 600, 601, 604, 625, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 800x600@75Hz */
{ MODEPREFIX("800x600"), 50000, 800, 856, 976, 1040, 0, 600, 637, 643, 666, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 800x600@72Hz */
{ MODEPREFIX("1152x864"), 108000, 1152, 1216, 1344, 1600, 0, 864, 865, 868, 900, 0, V_PHSYNC | V_PVSYNC, MODESUFFIX }, /* 1152x864@75Hz */
};
static DisplayModePtr
DDCModesFromEstablished(int scrnIndex, struct established_timings *timing,
ddc_quirk_t quirks)
{
DisplayModePtr Modes = NULL, Mode = NULL;
CARD32 bits = (timing->t1) | (timing->t2 << 8) |
((timing->t_manu & 0x80) << 9);
int i;
for (i = 0; i < 17; i++) {
if (bits & (0x01 << i)) {
Mode = xf86DuplicateMode(&DDCEstablishedModes[i]);
Modes = xf86ModesAdd(Modes, Mode);
}
}
return Modes;
}
/*
*
*/
static DisplayModePtr
DDCModesFromStandardTiming(int scrnIndex, struct std_timings *timing,
ddc_quirk_t quirks)
{
DisplayModePtr Modes = NULL, Mode = NULL;
int i;
for (i = 0; i < STD_TIMINGS; i++) {
if (timing[i].hsize && timing[i].vsize && timing[i].refresh) {
Mode = xf86CVTMode(timing[i].hsize, timing[i].vsize,
timing[i].refresh, FALSE, FALSE);
Mode->type = M_T_DRIVER;
Modes = xf86ModesAdd(Modes, Mode);
}
}
return Modes;
}
/*
*
*/
static DisplayModePtr
DDCModeFromDetailedTiming(int scrnIndex, struct detailed_timings *timing,
Bool preferred, ddc_quirk_t quirks)
{
DisplayModePtr Mode;
/*
* Refuse to create modes that are insufficiently large. 64 is a random
* number, maybe the spec says something about what the minimum is. In
* particular I see this frequently with _old_ EDID, 1.0 or so, so maybe
* our parser is just being too aggresive there.
*/
if (timing->h_active < 64 || timing->v_active < 64) {
xf86DrvMsg(scrnIndex, X_INFO,
"%s: Ignoring tiny %dx%d mode\n", __func__,
timing->h_active, timing->v_active);
return NULL;
}
/* We don't do stereo */
if (timing->stereo) {
xf86DrvMsg(scrnIndex, X_INFO,
"%s: Ignoring: We don't handle stereo.\n", __func__);
return NULL;
}
/* We only do seperate sync currently */
if (timing->sync != 0x03) {
xf86DrvMsg(scrnIndex, X_INFO,
"%s: %dx%d Warning: We only handle seperate"
" sync.\n", __func__, timing->h_active, timing->v_active);
}
Mode = xnfalloc(sizeof(DisplayModeRec));
memset(Mode, 0, sizeof(DisplayModeRec));
Mode->type = M_T_DRIVER;
if (preferred)
Mode->type |= M_T_PREFERRED;
if( ( quirks & DDC_QUIRK_135_CLOCK_TOO_HIGH ) &&
timing->clock == 135000000 )
Mode->Clock = 108880;
else
Mode->Clock = timing->clock / 1000.0;
Mode->HDisplay = timing->h_active;
Mode->HSyncStart = timing->h_active + timing->h_sync_off;
Mode->HSyncEnd = Mode->HSyncStart + timing->h_sync_width;
Mode->HTotal = timing->h_active + timing->h_blanking;
Mode->VDisplay = timing->v_active;
Mode->VSyncStart = timing->v_active + timing->v_sync_off;
Mode->VSyncEnd = Mode->VSyncStart + timing->v_sync_width;
Mode->VTotal = timing->v_active + timing->v_blanking;
/* perform basic check on the detail timing */
if (Mode->HSyncEnd > Mode->HTotal || Mode->VSyncEnd > Mode->VTotal) {
xfree(Mode);
return NULL;
}
xf86SetModeDefaultName(Mode);
/* We ignore h/v_size and h/v_border for now. */
if (timing->interlaced)
Mode->Flags |= V_INTERLACE;
if (timing->misc & 0x02)
Mode->Flags |= V_PVSYNC;
else
Mode->Flags |= V_NVSYNC;
if (timing->misc & 0x01)
Mode->Flags |= V_PHSYNC;
else
Mode->Flags |= V_NHSYNC;
return Mode;
}
/*
*
*/
static void
DDCGuessRangesFromModes(int scrnIndex, MonPtr Monitor, DisplayModePtr Modes)
{
DisplayModePtr Mode = Modes;
if (!Monitor || !Modes)
return;
/* set up the ranges for scanning through the modes */
Monitor->nHsync = 1;
Monitor->hsync[0].lo = 1024.0;
Monitor->hsync[0].hi = 0.0;
Monitor->nVrefresh = 1;
Monitor->vrefresh[0].lo = 1024.0;
Monitor->vrefresh[0].hi = 0.0;
while (Mode) {
if (!Mode->HSync)
Mode->HSync = ((float) Mode->Clock ) / ((float) Mode->HTotal);
if (!Mode->VRefresh)
Mode->VRefresh = (1000.0 * ((float) Mode->Clock)) /
((float) (Mode->HTotal * Mode->VTotal));
if (Mode->HSync < Monitor->hsync[0].lo)
Monitor->hsync[0].lo = Mode->HSync;
if (Mode->HSync > Monitor->hsync[0].hi)
Monitor->hsync[0].hi = Mode->HSync;
if (Mode->VRefresh < Monitor->vrefresh[0].lo)
Monitor->vrefresh[0].lo = Mode->VRefresh;
if (Mode->VRefresh > Monitor->vrefresh[0].hi)
Monitor->vrefresh[0].hi = Mode->VRefresh;
Mode = Mode->next;
}
}
static ddc_quirk_t
xf86DDCDetectQuirks(int scrnIndex, xf86MonPtr DDC, Bool verbose)
{
ddc_quirk_t quirks;
int i;
quirks = DDC_QUIRK_NONE;
for (i = 0; ddc_quirks[i].detect; i++) {
if (ddc_quirks[i].detect (scrnIndex, DDC)) {
if (verbose) {
xf86DrvMsg (scrnIndex, X_INFO, " EDID quirk: %s\n",
ddc_quirks[i].description);
}
quirks |= ddc_quirks[i].quirk;
}
}
return quirks;
}
/**
* Applies monitor-specific quirks to the decoded EDID information.
*
* Note that some quirks applying to the mode list are still implemented in
* xf86DDCGetModes.
*/
void
xf86DDCApplyQuirks(int scrnIndex, xf86MonPtr DDC)
{
ddc_quirk_t quirks = xf86DDCDetectQuirks (scrnIndex, DDC, FALSE);
int i;
for (i = 0; i < DET_TIMINGS; i++) {
struct detailed_monitor_section *det_mon = &DDC->det_mon[i];
if (det_mon->type != DT)
continue;
if (quirks & DDC_QUIRK_DETAILED_H_IN_CM)
det_mon->section.d_timings.h_size *= 10;
if (quirks & DDC_QUIRK_DETAILED_V_IN_CM)
det_mon->section.d_timings.v_size *= 10;
if (quirks & DDC_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
det_mon->section.d_timings.h_size = 10 * DDC->features.hsize;
det_mon->section.d_timings.v_size = 10 * DDC->features.vsize;
}
}
}
/**
* Walks the modes list, finding the mode with the largest area which is
* closest to the target refresh rate, and marks it as the only preferred mode.
*/
static void
xf86DDCSetPreferredRefresh(int scrnIndex, DisplayModePtr modes,
float target_refresh)
{
DisplayModePtr mode, best = modes;
for (mode = modes; mode; mode = mode->next)
{
mode->type &= ~M_T_PREFERRED;
if (mode == best) continue;
if (mode->HDisplay * mode->VDisplay >
best->HDisplay * best->VDisplay)
{
best = mode;
continue;
}
if (mode->HDisplay * mode->VDisplay ==
best->HDisplay * best->VDisplay)
{
double mode_refresh = xf86ModeVRefresh (mode);
double best_refresh = xf86ModeVRefresh (best);
double mode_dist = fabs(mode_refresh - target_refresh);
double best_dist = fabs(best_refresh - target_refresh);
if (mode_dist < best_dist)
{
best = mode;
continue;
}
}
}
if (best)
best->type |= M_T_PREFERRED;
}
_X_EXPORT DisplayModePtr
xf86DDCGetModes(int scrnIndex, xf86MonPtr DDC)
{
int i;
DisplayModePtr Modes = NULL, Mode;
ddc_quirk_t quirks;
Bool preferred;
xf86DrvMsg (scrnIndex, X_INFO, "EDID vendor \"%s\", prod id %d\n",
DDC->vendor.name, DDC->vendor.prod_id);
quirks = xf86DDCDetectQuirks(scrnIndex, DDC, TRUE);
preferred = PREFERRED_TIMING_MODE(DDC->features.msc);
if (quirks & DDC_QUIRK_FIRST_DETAILED_PREFERRED)
preferred = TRUE;
if (quirks & (DDC_QUIRK_PREFER_LARGE_60 | DDC_QUIRK_PREFER_LARGE_75))
preferred = FALSE;
for (i = 0; i < DET_TIMINGS; i++) {
struct detailed_monitor_section *det_mon = &DDC->det_mon[i];
switch (det_mon->type) {
case DT:
Mode = DDCModeFromDetailedTiming(scrnIndex,
&det_mon->section.d_timings,
preferred,
quirks);
preferred = FALSE;
Modes = xf86ModesAdd(Modes, Mode);
break;
case DS_STD_TIMINGS:
Mode = DDCModesFromStandardTiming(scrnIndex,
det_mon->section.std_t,
quirks);
Modes = xf86ModesAdd(Modes, Mode);
break;
default:
break;
}
}
/* Add established timings */
Mode = DDCModesFromEstablished(scrnIndex, &DDC->timings1, quirks);
Modes = xf86ModesAdd(Modes, Mode);
/* Add standard timings */
Mode = DDCModesFromStandardTiming(scrnIndex, DDC->timings2, quirks);
Modes = xf86ModesAdd(Modes, Mode);
if (quirks & DDC_QUIRK_PREFER_LARGE_60)
xf86DDCSetPreferredRefresh(scrnIndex, Modes, 60);
if (quirks & DDC_QUIRK_PREFER_LARGE_75)
xf86DDCSetPreferredRefresh(scrnIndex, Modes, 75);
return Modes;
}
/*
* Fill out MonPtr with xf86MonPtr information.
*/
_X_EXPORT void
xf86DDCMonitorSet(int scrnIndex, MonPtr Monitor, xf86MonPtr DDC)
{
DisplayModePtr Modes = NULL, Mode;
int i, clock;
Bool have_hsync = FALSE, have_vrefresh = FALSE, have_maxpixclock = FALSE;
if (!Monitor || !DDC)
return;
Monitor->DDC = DDC;
Monitor->widthmm = 10 * DDC->features.hsize;
Monitor->heightmm = 10 * DDC->features.vsize;
/* If this is a digital display, then we can use reduced blanking */
if (DDC->features.input_type)
Monitor->reducedblanking = TRUE;
/* Allow the user to also enable this through config */
Modes = xf86DDCGetModes(scrnIndex, DDC);
/* Skip EDID ranges if they were specified in the config file */
have_hsync = (Monitor->nHsync != 0);
have_vrefresh = (Monitor->nVrefresh != 0);
have_maxpixclock = (Monitor->maxPixClock != 0);
/* Go through the detailed monitor sections */
for (i = 0; i < DET_TIMINGS; i++) {
switch (DDC->det_mon[i].type) {
case DS_RANGES:
if (!have_hsync) {
if (!Monitor->nHsync)
xf86DrvMsg(scrnIndex, X_INFO,
"Using EDID range info for horizontal sync\n");
Monitor->hsync[Monitor->nHsync].lo =
DDC->det_mon[i].section.ranges.min_h;
Monitor->hsync[Monitor->nHsync].hi =
DDC->det_mon[i].section.ranges.max_h;
Monitor->nHsync++;
} else {
xf86DrvMsg(scrnIndex, X_INFO,
"Using hsync ranges from config file\n");
}
if (!have_vrefresh) {
if (!Monitor->nVrefresh)
xf86DrvMsg(scrnIndex, X_INFO,
"Using EDID range info for vertical refresh\n");
Monitor->vrefresh[Monitor->nVrefresh].lo =
DDC->det_mon[i].section.ranges.min_v;
Monitor->vrefresh[Monitor->nVrefresh].hi =
DDC->det_mon[i].section.ranges.max_v;
Monitor->nVrefresh++;
} else {
xf86DrvMsg(scrnIndex, X_INFO,
"Using vrefresh ranges from config file\n");
}
clock = DDC->det_mon[i].section.ranges.max_clock * 1000;
if (!have_maxpixclock && clock > Monitor->maxPixClock)
Monitor->maxPixClock = clock;
break;
default:
break;
}
}
if (Modes) {
/* Print Modes */
xf86DrvMsg(scrnIndex, X_INFO, "Printing DDC gathered Modelines:\n");
Mode = Modes;
while (Mode) {
xf86PrintModeline(scrnIndex, Mode);
Mode = Mode->next;
}
/* Do we still need ranges to be filled in? */
if (!Monitor->nHsync || !Monitor->nVrefresh)
DDCGuessRangesFromModes(scrnIndex, Monitor, Modes);
/* look for last Mode */
Mode = Modes;
while (Mode->next)
Mode = Mode->next;
/* add to MonPtr */
if (Monitor->Modes) {
Monitor->Last->next = Modes;
Modes->prev = Monitor->Last;
Monitor->Last = Mode;
} else {
Monitor->Modes = Modes;
Monitor->Last = Mode;
}
}
}
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