Interfacing (DSI, CSI, I2C, etc.) • Re: 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

Statistics: Posted by 6by9 — Tue Feb 20, 2024 12:21 pm