HDMI problem on the custom carrier board for P3668

Hi,I use a custom board that refered the 3509,and our custom board with P3668 can power on and log in with termial,but can’t display on screen of hdmi.
Custom board use the same MCU as 3509, and flashed with nvidia program.
Why our custom board can’t display on screen of hdmi? Will you please give us some advice on it?
Best regards

Attach the dmesg log for the custom carrier board.
dmesg_cb.txt (57.4 KB)
dmesg of 3509 have the information: Bootloader disp_param detected.Detected mode:1920X1080(0x0mm) pclk=148350937.But the custom carrier board have not this information.
xrandr : can’t open display

You need to export DISPLAY=:0 before running xrandr.

Also, please share your xorg.0.log from /var/log/

I have update dtb as ‘Flash Specific Device Tree’,add “FTD /boot/dtb/tegra186-p3636-0001-p3509-0000-a01.dtb” to the boot file.But the screen still no display.
Attach Xorg.log as follow:
Xorg.txt (11.7 KB)

The result xrandr is as follow:
nvidia@ubuntu:~$ xrandr
No protocol specified
Can’t open display :0

extlinux.conf as follow:
nvidia@ubuntu:~$ cat /boot/extlinux/extlinux.conf
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
FTD /boot/dtb/tegra186-p3636-0001-p3509-0000-a01.dtb
APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 nv-auto-config

I am not sure if you ever read your own comment.

What you posted in extlinux.conf is not same as what you said…

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