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EDID: Catch monitors that encode aspect ratio for physical size.

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This is not legal in either EDID 1.3 or 1.4, but hey, when did a little
thing like legality stop anyone.
This commit is contained in:
Adam Jackson 2008-10-10 13:41:50 -04:00
parent 956a4ba40b
commit 0660dd9d70
1 changed files with 41 additions and 0 deletions
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41
hw/xfree86/ddc/interpret_edid.c
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@ -85,6 +85,47 @@ handle_edid_quirks(xf86MonPtr m)
}
}
}
/*
* some monitors encode the aspect ratio instead of the physical size.
* try to find the largest detailed timing that matches that aspect
* ratio and use that to fill in the feature section.
*/
if ((m->features.hsize == 16 && m->features.vsize == 9) ||
(m->features.hsize == 16 && m->features.vsize == 10) ||
(m->features.hsize == 4 && m->features.vsize == 3) ||
(m->features.hsize == 5 && m->features.vsize == 4)) {
int real_hsize = 0, real_vsize = 0;
float target_aspect, timing_aspect;
target_aspect = (float)m->features.hsize / (float)m->features.vsize;
for (i = 0; i < 4; i++) {
if (m->det_mon[i].type == DT) {
struct detailed_timings *timing;
timing = &m->det_mon[i].section.d_timings;
if (!timing->v_size)
continue;
timing_aspect = (float)timing->h_size / (float)timing->v_size;
if (fabs(1 - (timing_aspect / target_aspect)) < 0.05) {
real_hsize = max(real_hsize, timing->h_size);
real_vsize = max(real_vsize, timing->v_size);
}
}
}
if (real_hsize && real_vsize) {
/* convert mm to cm */
m->features.hsize = (real_hsize + 5) / 10;
m->features.vsize = (real_vsize + 5) / 10;
} else {
m->features.hsize = m->features.vsize = 0;
}
xf86Msg(X_INFO, "Quirked EDID physical size to %dx%d cm\n",
m->features.hsize, m->features.vsize);
}
}
xf86MonPtr