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-   -   How to plug Three Monitors on a Raspberry PI 4 ? (https://www.linuxquestions.org/questions/linux-embedded-and-single-board-computer-78/how-to-plug-three-monitors-on-a-raspberry-pi-4-a-4175731390/)

Xeratul 11-30-2023 08:52 AM
How to plug Three Monitors on a Raspberry PI 4 ?
 
Hello,

How to plug Three Monitors on a Raspberry PI 4 ?

https://upload.wikimedia.org/wikiped...el_B_-_Top.jpg

Kind regards

pan64 11-30-2023 09:54 AM
do you have a question here? Or why did you post that picture?
https://forums.raspberrypi.com/viewtopic.php?t=243812

business_kid 12-01-2023 08:26 AM
Quote:
How to plug Three Monitors on a Raspberry PI 4 ?
You don't! It barely drives 1 effectively.

Xeratul 12-25-2023 02:20 AM
It seems that https://forums.raspberrypi.com/viewtopic.php?t=243812

a small tft would be possible on GPIO, but I havent tried.

business_kid 12-25-2023 11:00 AM
Quote:
Originally Posted by Xeratul (Post 6472540)
It seems that https://forums.raspberrypi.com/viewtopic.php?t=243812

a small tft would be possible on GPIO, but I haven't tried.
on GPIO, you'd get enough to drive an 80x25 terminal, but hardly a monitor. With framebuffer, you'd be amazed how much cpu one monitor uses. On RPi OS, you'd do better, but I'm pessimistic.

Xeratul 12-30-2023 11:52 PM
Quote:
Originally Posted by business_kid (Post 6472610)
on GPIO, you'd get enough to drive an 80x25 terminal, but hardly a monitor. With framebuffer, you'd be amazed how much cpu one monitor uses. On RPi OS, you'd do better, but I'm pessimistic.
The problem is that fbcp takes a lot of cpu
/dev/fb0 => /dev/fb1 and it is slow


https://github.com/balena-labs-projects/fbcp

business_kid 12-31-2023 04:52 AM
Quote:
Originally Posted by Xeratul (Post 6473698)
The problem is that fbcp takes a lot of cpu
/dev/fb0 => /dev/fb1 and it is slow
Yes I know. but I don't think I'm getting through. Perhaps it's a case of "Reisner's Rule of Conceptual Inertia:"
Code:
If you think big enough, you'll never have to do it.


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