Hi all,

HW: QCS6490 custom board, close to RB3Gen2. SW: Ubuntu 24.04.5 kernel 6.8.0-1084.89.

I'm using DRM/MSM with the eDP interface set to maximum debug output. Everything looks great, with no error messages at all.

However, the screen is blank.

A few details.

On the same hardware modifications with a DSI interface, everything works flawlessly.

On hardware with an eDP interface running the QCLinux version (DRM/SDE), everything works (SDE source code is available).

I’ve spent 5 months trying to find the problem, so far without success. There’s a lot of debugging information, and I didn’t include it in this post. If necessary, I can provide it.

Conclusion: I’m missing some small detail.

An aggravating factor is that I don’t have access to the documentation for HW.

Ultimately, I need advice on which part of DRM might be the problem.

Thanks,

Dmitriy Antonets