Using a Tiger lake laptop with NetBSD 10 I can not get the HDMI port working.
xrandr -q only prints an 1 entry named "default" for the builtin display.
Is there anything to check or try?
If you have a Tiger Lake GPU, then you're very likely not running with DRMKMS,
and only the genfb driver has attached. With genfb, only the primary display
gets output. See wsdisplay(4).
And, if you want to rotate the picture, you can only do it in X. See wsfb(4).
Try,
fgrep genfb /var/run/dmesg.boot
see if it says `drm at genfb0 not configured'.
-RVP
