system freezes when loading amdgpu

[Johannes Lundberg]

On 3/5/19 6:07 AM, Pierre DAVID wrote:
> 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. 

Hmm :(

Did you set all the sysctls as described in the "debugging tips" section
in https://wiki.freebsd.org/Graphics?

dev.drm.skip_ddb="1"
debug.debugger_on_panic=0
dev.drm.drm_debug_persist="1"
dev.drm.drm_debug=-1

With these set (add in /boot/loader.conf and reboot), do you get a core
dump or some drm log messages left in dmesg after reboot?


>
> Pierre
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