PROCESSOR-SDK-AM62X: libdrm modetest issue

Hi

I am using SK-AM62B-P1 + Debian SDK.

And trying operate display application refering with Yocto SDK manual.

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_02_01_09/exports/docs/linux/Foundational_Components/Graphics/Graphics_and_Display.html#display

By default, modetest command in libdrm is not installed.

So I install libdrm2, libdrm-test module.

And do modetest command.

But the command not hit HDMI connector.

Could we not use modetest in Debian SDK?

Or is there anything module that we should install?

Thanks,

GR