xserver and splitting ultra-wide monitors

[Michael Wyraz]

Hello xorg developers,

I have attached my patch to xserver that removes the 
"one-monitor-per-output" restriction. My attempt and the result is 
described in 
https://gitlab.gnome.org/GNOME/gtk/-/issues/2013#note_1564376 . The 
result is amazing, split-screen works flawlessly with all of my desktop 
applications, similar as if I had 2 monitors.

I'd be happy if that could make it into xserver. Should I create a PR 
from the patch in the gitlab?

Kind regards,

Michael.


Am 29.09.22 um 22:41 schrieb Keith Packard:
> Michael Wyraz <michael at wyraz.de> writes:
>
>> For the second monitor, the output must be set to "none" which is
>> obviously wrong since it is connected to a device. The reason why it is
>> set to "none" is some code in xserver that removes an monitor if another
>> one is added to the same output:
> That's actually required in the RandR spec:
>
> 	For each output in 'info.outputs, each one is removed from all
> 	pre-existing Monitors. If removing the output causes the list of
> 	outputs for that Monitor to become empty, then that Monitor will
> 	be deleted as if RRDeleteMonitor were called.
>
> The notion of splitting one physical output into multiple virtual
> monitors was not considered when this extension was defined, which is
> why it doesn't work. I don't see any particular reason for *not*
> supporting your use case.
>
> However, there are subtleties here. We want to remove any automatically
> created 'Monitor' objects when mapping user-specified monitors to
> them, and we want to re-generate automatically generated 'Monitors' when
> all virtual monitors associated with an output are removed.
>
> I think what we want is:
>
>   * If no user-specified Monitors map to a particular Output, then automatically
>     create a Monitor for that Output
>
>   * If any user-specified Monitors map to a particular Output, then
>     remove the automatically generated Monitor for that Output.
>     
> In the current spec, there's no real separation between user-specified
> and automatically-generated Monitors, I think that would be necessary to
> make this work?
>
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