Jetson no any DRM components

[Evil_mage]

When I use :

modetest 

There are no any infomation for DRM

And then, I try to use drm_info:

drm_info

So, does the jetson not achieve the standard DRM Framework?

[DaneLLL]

Hi,
If you are asking for direct rendering manager, we have the sample in jetson_multimedia_api. Please check

Jetson Linux API Reference: 08_video_dec_drm (Direct Rendering Manager) | NVIDIA Docs

[Evil_mage]

Thank You! I am trying to solve a DisplayPort(DP) driver problem.
I am adapting kernel-6.6 for jetson， and DP connector and GPU work fine, except for one small issue:

When I plug the DP interface before system boot, the screen will show the kernel log, and disappeared at X window runing。

I am not sure whether the kernel driver(DRM) has problem，so I want to test how each part works to determine what the problem is.
I’ve found that tegra’s DRM implementation is different from the usual, it doesn’t have connectors, panels, etc.

Thanks, this helped me a lot！

[Evil_mage]

How can I download

https://developer.nvidia.com/embedded/downloads can not find any sample.
And my Jetson /usr/src structure is :

[Evil_mage]

I found it at https://developer.nvidia.com/embedded/jetson-linux-r3640

Not in dwonload center.

[Evil_mage]

It runing with error.

[DaneLLL]

Hi,
You should be using Jetson Orin Nano instead of Jetson Nano. Please check the document for Orin Nano:

Jetson Linux API Reference: 08_video_dec_drm (Direct Rendering Manager) | NVIDIA Docs

You can install the samples through SDKManager or apt-get install command.

[Evil_mage]

Picture of above is the test result for Jetson Orin nano 。

I’m trying to determine if there is a DRM driver issue or if X11 has to be the problem. Is there a good way to determine that?

If the DP is inserted after system boot on, it is displayed normally. If you plug in the DP before booting, it will only show the kernel log, and then there will be no DP signal when you enter the desktop.

There is syslog for DP plugged before booting:
syslog.log (267.6 KB)

and I can not find any error for display.

[DaneLLL]

Hi,
Please try Orin Nano developer kit with default Jetpack 6.1(K5.15). To ensure it can be run successfully on the setup.

[Evil_mage]

Yes, I try to run with kerne5.15, It is ok: