We’re ok for now, but I’ll outline what we ended up doing.
a) I applied the patch provided by WayneWWW found here,
https://devtalk.nvidia.com/default/topic/1003956/jetson-tx2/tx2-not-booting-up-with-hdmi-connected/2
it prevented the boot hangup.
b) The monitor vendor suggested that we replace the edid in the monitor
with a known good edid. We got an adapter/emulator that let us do this
and now the nvidia video system and x driver can see the modes (i.e xrandr --verbose)
shows all the modes. Not sure I agreed with this but we were in a hurry.
c) The problem was made more complex because I believe we have some marginal
wiring or cabling. The monitor is now solid on lower resolutions, but erratic
on higher resolutions.
d) I did attempt to move to the 28.2 release. There wasn’t any hang at boot but
the resolution was stuck on very low (vga) resolution, xrandr didn’t show any
other resolutions, so we gave up on that approach for now.
I did capture the EDID information for the monitor that was giving us problems.
# cat /sys/kernel/debug/tegradc.0/edid
00 ff ff ff ff ff ff 00 1c 83 80 10 00 00 00 00
29 1b 01 03 80 00 00 78 e6 2e e4 a4 57 4a 9c 25
11 50 54 ff ff 80 d1 c0 81 80 61 4f 8b c0 a9 c0
45 40 01 01 01 01 94 43 80 90 72 38 26 40 80 d0
13 00 e0 20 11 00 00 1e 00 00 00 10 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10
00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 2d
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Thanks, for the help. I will try and post anything more we find.
Cary