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This patch more fully implements the training patterns for DP 1.2 per the spec,
which then allows more monitors to successfully train and therefore connect. In
my case it was an LG 34UM68-P.
Secondly, this fixes EDID shifting to work with a wider range of values, notably
ones which wrap.
Lastly, a small correction in vesa.c as to which bits are used to determine
available connections.
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EDID 1.3 section 5 gives a table describing the priority order of
timing information. Use this ordering when constructing the EDID
mode list.
Since aux/vga selects the first mode in the modelist that matches
the given size, it will now select the mode of that size with the
highest preference. Or, if you set vgasize=auto (or some other
string without an 'x'), aux/vga will select the Preferred Detailed
Timing.
This should make it unnecessary to modify vgadb in many cases.
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detailed timing in edid
vbs/vbe members in Mode was only used in the vesadb
and cannot be changed from vgadb.
use shs/ehs in drivers when refering to the horizontal
sync pulse. clarify the matter in a comment.
link detailed timing modes at the head of the edid
modelist. these are the modes we'r interested in,
not the ones from vesadb.
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igfx and vesa can determine monitor timing information from ddc
and store the edid info for connected monitors in vga->edid[].
when monitor type cannot be found in vgadb, we consult the edid
information and make a mode based on the edid info.
this avoids having to maintain a vgadb entry for each monitor.
monitor can be set to "[width]x[height]@[freq]Hz" for a specific
edid setting. when not found, a mode is searched based on the
size.
so the following should work:
aux/vga -m 1366x768@60Hz -l 1366x768x32
aux/vga -m auto -l 1366x768x32
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