fbcon on one of multiple displays

[Alex Deucher]

On Mon, Dec 4, 2023 at 8:52 AM Eric Nelson <eric at nelint.com> wrote:
>
> Thanks Javier,
>
> On 12/4/23 03:11, Javier Martinez Canillas wrote:
> > Eric Nelson <eric at nelint.com> writes:
> >
> > Hello Eric,
> >
> >> Hi all,
> >>
> >> Is there a way to configure a framebuffer console on a specific display
> >> on a machine with multiple displays?
> >>
> >
> > Have you looked at https://www.kernel.org/doc/Documentation/fb/fbcon.txt ?
> >
> > There is a sysfb interface to bind / unbind fbdev devices to fbcon's VT
> > (/sys/class/vtconsole/vtcon1/bind) and also kernel command line parameter
> > to choose which fbdev driver is mapped to which VT console (fbcon=map:n).
> >
>
> I have seen this, but it's not clear how we can use this. In our case,
> we have a single driver for two displays.
>
> I hope to get a device on my desk this week to test it out.

Are you referring to two devices that just both happen to use the same
driver, or multiple displays driving by a single device?  For the
latter, drm drivers at least only expose a single "display" via the
fbcon emulation.

Alex