Comment 3 for bug 1819968

$ xrandr --props
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
VGA1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 410mm x 230mm
        EDID:
                00ffffffffffff001e6d094c07230800
                071601036c291778ead025a258559c28
                0f5054a76a00314f454f614f81c00101
                010101010101662156aa51001e30468f
                33009ae61000001e000000fd00384b1e
                3d09000a202020202020000000fc0045
                313934320a20202020202020000000ff
                003230374e444e5546503235350a005e
   1366x768 59.79*+
   1280x720 59.97 +
   1024x768 75.08 75.03 60.00
   832x624 74.55
   800x600 75.00 60.32 56.25
   640x480 75.00 60.00
   720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
DP1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ find /sys/devices/ |fgrep -i edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid

$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
00000000: 00ff ffff ffff ff00 4c83 5248 0000 0000 ........L.RH....
00000010: 0018 0103 9522 1378 0a71 0593 5557 8f29 .....".x.q..UW.)
00000020: 2050 5400 0000 0101 0101 0101 0101 0101 PT.............
00000030: 0101 0101 0101 411c 56a0 5000 1630 3020 ......A.V.P..00
00000040: 2500 58c2 1000 0019 0000 000f 0000 0000 %.X.............
00000050: 0000 0000 0020 5203 1500 0000 00fe 0053 ..... R........S
00000060: 414d 5355 4e47 0a20 4c83 4154 0000 00fe AMSUNG. L.AT....
00000070: 004c 544e 3135 3641 5433 374c 3032 00db .LTN156AT37L02..
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid
$