Re: amdgpu driver

[Jeff Frasca <thatguy%jeff-frasca.name@localhost>]

On Thu, Jul 2, 2026 at 10:25 AM Rhialto <rhialto%falu.nl@localhost> wrote:
> > [  4022.877] (II) RADEON: Driver for ATI/AMD Radeon chipsets:
>
> I am curious if you also get the corruptions with the "radeon" driver. I
> had to switch to the integrated Intel graphics, but that lacks support
> for whatever x11/redshift does, and also I can't use mpv in gpu mode,
> but I have to use "vo=xv" in ~/.config/mpv/mpv.con. Likewise, wip/golly
> doesn't display its life world. So I'd rather switch back.

I know I'm doing a bit of thread necromancy here (I missed this 2
months ago because of personal life stuff).

What does the corruption look like?  Is it random grey bars on the
screen that are approximately 16px wide and 1px tall?

I have a 5450 that I have used for my wayland work, and when I run
bare metal, it works but I get those 16x1 lines all over the screen
seemingly at random.

Oddly enough, when I had my machine setup to run NetBSD under QEMU
with PCI passthrough for the 5450, it worked flawlessly, so there's
something in there with how the video card memory is getting mapped,
and I suspect something is writing some 64-byte structure over memory
that should only be getting used for the GPU, but moving the location
of the card on the PCI bus fixes it.

I haven't been able to dig further because too much life has been
happening (not unrelated to my 2 months later reply).  I also don't
install X11 on my wayland dev boxes (because I need Mesa from pkgsrc),
so I hadn't been able to reproduce on X.  Definitely curious if it's
happening to both the Xserver and my compositor.

Finally, it's worth trying to set your Xorg.conf to use modesetting
only for the 5450 driver to skip the accelerated pipeline.  I'm pretty
sure that's where the corruption is happening.

Jeff