Interfacing (DSI, CSI, I2C, etc.) • Connecting Waveshare Display(s)

Hi all,

I fear this is gonna be another "my Waveshare Display won't connect" tread.
I'm currently trying to get the "8 inch DSI LCD (C)" to work on my Raspberry Pi 4 (4GB model).

Having seen threads like this viewtopic.php?t=354403 and this https://github.com/waveshare/Waveshare-DSI-LCD/issues/4 I have a good idea who's to blame for this situation (Waveshare), but nevertheless I am hoping for some pointers here since my own expertise on displays / drivers etc is quite limited.

My setup:
Raspberry Pi 4 mounted to the Waveshare display and connected to it via DSI. Second screen (confirmed working in multiple other setups) connected via HDMI.

What I've tried and how it went:
- Using current 64-bit Raspberry Pi OS (bookworm) out-of-the-box (assuming that maybe it would work "automagically" like the official display)
- Using legacy 32-bit Raspberry Pi OS (bullseye) out-of-the-box
in both cases, the DSI display stayed black.
- Using current 64-bit Raspberry Pi OS (bookworm) and installing the Waveshare driver based on the instructions in the Waveshare wiki
--> Errors during the install script: "exec_format_error" when the script tries to load the driver with modprobe
Also, the script appends lines to /boot/config.txt even though it should be /boot/firmware/config.txt. But moving the lines to the correct place didn't help.
--> Screen also stayed black
- Using current 64-bit Raspberry Pi OS (bookworm) and upgrading to latest kernel using rpi-update
--> Out-of-the-box the display still doesn't work, and since there is no Waveshare driver for that kernel, that's also not an option

So I'm not sure how to proceed now.
Currently I'm using the pre-configured image provided by Waveshare, which is quite outdated. Since I would like to work on an up-to-date system, this is no long-time option for me. So what would be the best starting point for further investigation?

Statistics: Posted by st_jwinter — Tue Feb 20, 2024 11:42 am

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