Control brightness of display using ddcutil

Hey i am using xavier agx DK , I am using a mimo um-1080ch-of which is connected through HDMI . I want to control the brightness of the screen but ddcutil doesnt find any display connected

echo 1 > /sys/kernel/debug/tegra_hdmi/ddc_power_toggle

Run this and try the ddcutil again.

Hi @WayneWWW ,
My sys/kernel/debug is an empty directory so cant really set this data

actually its a permission denied error

You need to run as a root.

hi @WayneWWW ,
I was running it as root ,but i found the solution here for it Permission denied on /sys/kernel/debug its working now thanks for your help

Actually, if you need to follow that command to make it work… you better check your installation for rootfs and BSP…

IMO this should not be needed.

hi @WayneWWW ,
okay i will look into it.