[Bug 257810] x11/gnome3(-lite) & x11/gdm lags significantly on amdgpu

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257810

--- Comment #7 from Graham Perrin <grahamperrin@gmail.com> ---
(In reply to Neel Chauhan from comment #6)

Thanks, is there any non-GNOME use case that benefits from DRI 2? 

I assume that <https://wiki.freebsd.org/GraphicsOld/DRI3> is stale but not yet
<https://wiki.freebsd.org/CategoryStale> categorised as such. 

What's the simplest possible concise explanation of preferring 2 instead of 3? 

(I see <https://en.wikipedia.org/wiki/Direct_Rendering_Infrastructure#DRI3> but
trying to interpret that in normal order, let alone in reverse (2 instead of
3), is quite mind-bending.)

<https://www.freebsd.org/cgi/man.cgi?query=xorg.conf&sektion=5&manpath=FreeBSD-Ports#DRI_SECTION>
directs readers to <https://dri.freedesktop.org/> but then (sorry) it's not
clear which path to take; <https://dri.freedesktop.org/wiki/CategoryFaq/> is a
scattering of things. 

Here in Bugzilla is not the best place for explanations, so maybe someone can
edit something temporarily into <https://wiki.freebsd.org/Graphics> or
<https://wiki.freebsd.org/Gnome> pending more formal edition into (I guess)
<https://www.freebsd.org/gnome/>.

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