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Graphics, sound and multimedia • Re: vc4-kms-dpi-generic and Waveshare GPM280

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What do you think is the correct value?
the one written in the data sheet! Don't think it's 32MHZ there as 32MHz was used by many people as a 'bx chance' value for getting DPI started

When you run below command, which refresh rate does it show for the screen

Code:

kmsprint -m
is rotation working now or not?

I've seen an issue with rotation where 90degrees rotation resulted in 270degrees and vice versa - see viewtopic.php?p=2173777#p2173777 - did not check recently. So be sure you're not observing that behavior.
Here is the result of the command

Code:

root@gpm280:~# kmsprint -mConnector 0 (32) DPI-1 (connected)   0 480x640@87.17     32.000 480/26/16/10/-     640/25/10/15/-     87 (87.17) P|D
Behaviour is the same. I boot only to CLI and start there other apps like VLC, mpv, fbi or emulationstation. Only bootscreen is correct and the output during boot and command prompt. But the mentioned apps are not correctly rotated.

Is there a possibility to change from 480x640 to 640x480?

the 32MHz are written on the Waveshare homepage and the screen is working, so you mean, I should reduce the value? What is the advantage?

Statistics: Posted by mcpatric — Fri Jan 19, 2024 11:16 pm



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