max_framebuffers in config.txt

[Solskogen]

What is that used for? I can't seem to find any documentation about it.

[aBUGSworstnightmare]

framebuffer_width
The framebuffer_width command specifies the console framebuffer width in pixels. The default is the display width minus the total horizontal overscan.

framebuffer_height
The framebuffer_height command specifies the console framebuffer height in pixels. The default is the display height minus the total vertical overscan.

max_framebuffer_height, max_framebuffer_width
Specifies the maximum dimensions that the internal frame buffer is allowed to be.

Find it here https://www.raspberrypi.org/documentati ... tom%20Mode

[Solskogen]

That's not quite the same as max_framebuffers if I understand it correctly. max_framebuffers=2 Is what I find in config.txt

[epoch1970]

https://github.com/raspberrypi/firmware ... -509373742

[jamesh]

Looks like I missed that when updating the docs.

It does exactly what it says on the tin, defines the maximum number of framebuffers in the firmware. So if you have more than one display attached, you need to increase max_framebuffers to match. Currently either 1 or 2.

In legacy mode (not FKMS) you will get a linux framebuffer per display. In FKMS mode, although you still need to set max_framebuffers to match the number of physical displays, FKMS takes over the system, and simulates a single FB over those multiple displays.

[Solskogen]

Okay, so it should match the number of attached displays.
Thanks!