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xfree86: fix gtf support detection for EDID 1.4

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According to the "VESA Enhanced EDID Standard", all GTF compliant
displays are continuous frequency.

The GTF support flags in 'Display Range Limits Descriptor' cannot be
used if the display is a non-continuous frequency multi-mode display.

Closes #1105
Signed-off-by: Pascal VITOUX <vitoux.pascal@gmail.com>
Fixes: 6a79a737 ("xfree86: add drm modes on non-GTF panels")
Reviewed-by: Aaron Ma aaron.ma@canonical.com
This commit is contained in:
Pascal VITOUX
2020-11-27 16:54:59 +00:00
committed by Povilas Kanapickas
parent b75d0cca28
commit 34e2a64ce0
1 changed files with 1 additions and 1 deletions
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2
hw/xfree86/ddc/interpret_edid.c
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@@ -768,7 +768,7 @@ gtf_supported(xf86MonPtr mon)
} else {
for (i = 0; i < DET_TIMINGS; i++) {
struct detailed_monitor_section *det_timing_des = &(mon->det_mon[i]);
if (det_timing_des && (det_timing_des->type == DS_RANGES) &&
if (det_timing_des && (det_timing_des->type == DS_RANGES) && (mon->features.msc & 0x1) &&
(det_timing_des->section.ranges.display_range_timing_flags == DR_DEFAULT_GTF
|| det_timing_des->section.ranges.display_range_timing_flags == DR_SECONDARY_GTF))
return TRUE;