[Bug 245702] x11-drivers/xf86-video-ati-legacy does not work under 12.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245702

--- Comment #18 from Alexey Dokuchaev <danfe at FreeBSD.org> ---
(In reply to Greg V from comment #15)
> xf86 modesetting (or better: try Wayland) should still work with
> radeonkms, technically.
Probably should work in theory, but does not necessarily work in practice, see
my comment #8.

> But of course it's better to get a modern GPU like Polaris or Vega,
> supported by amdgpu.
Many of our users cannot (or do not want to for various reasons) replace the
video chip in their laptops.  Replacing a gfx card is often an option for PC
users only, and even they might refuse to throw away working hardware just
because software support sucks.

> There is currently just no one who is both motivated to work on old
> (pre-GCN) GPU support and skilled enough to debug and fix the issues.
I'm motivated, albeit unskilled, to fix support for pre-GCN cards.  Technically
this should be doable because they definitely used to work 2-3 years ago. 
However, I still can't decide whether I should start with figuring out when the
base DRM bits (or drm-legacy-kmod port) got broken, or forget about the legacy
bits and work with the new code provided by the latest drm-{current,devel}-kmod
ports.

(In reply to Niclas Zeising from comment #16)
> Most focus is on amdgpu, which supports hardware from the last 10
> years or so.
While NI (the last pre-GCN family) was released back in 2010, it had been used
for several years in AMD APU-based laptops.  I've purchased mine in 2016 and it
was still using it, so amdgpu(4) is not an option for me.

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