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xfree86: fix gtf support detection for EDID 1.4 

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;