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Date:      Wed, 6 Mar 2019 08:49:10 +0000
From:      Johannes Lundberg <johalun0@gmail.com>
To:        Pierre DAVID <pdagog@gmail.com>, x11@freebsd.org
Subject:   Re: system freezes when loading amdgpu
Message-ID:  <1cc99583-3096-3077-c13a-9c8143f254be@gmail.com>
In-Reply-To: <20190305060754.GB1375@vagabond>
References:  <20190225195558.GA1603@vagabond> <20190304094406.GB17710@vagabond> <6d097479-4678-7550-b90b-91fd2b88cf20@gmail.com> <20190305060754.GB1375@vagabond>

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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 i=
n
>> 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.=C2=A0

Hmm :(

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

dev.drm.skip_ddb=3D"1"
debug.debugger_on_panic=3D0
dev.drm.drm_debug_persist=3D"1"
dev.drm.drm_debug=3D-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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