system freezes when loading amdgpu

[Pierre DAVID]

On Mon, Mar 04, 2019 at 10:02:33AM +0000, Johannes Lundberg wrote:
>Hi
>
>Sorry to hear you're having problems... The good news is, I think your
>card is Southern Islands (SI) generation which means it's supported by
>both radeonkms and amdgpu. SI should be enabled in amdgpu by default in
>4.16 or later.
>
>To avoid any UEFI issues, I recommend booting in legacy BIOS mode if
>possible. This way you don't have to disable syscons.
>
>With drm-kmod radeonkms:
>
>pkg: xf86-video-ati
>xorg driver: "radeon"
>
>With drm-kmod amdgpu:
>
>pkg: xf86-video-amdgpu for "amdgpu", "modesetting" is included in
>xorg-server.
>xorg driver: "modesetting" or "amdgpu" (modesetting is probably better)
>

My system always boots in legacy BIOS mode (it's a pre-UEFI 
system).

I tried with radeonkms also: same thing occurs, the system is 
freezing.

>
>"The system freezes as soon as I kldload amdgpu (or if I start X)"
>
>Does this mean that you get freeze only sometimes in kldload amdgpu?
>

It always freezes when I kldload either amdgpu or radeonkms.

Pierre