A question about graphics subsystems under FreeBSD

[Greg V]

On Wed, Dec 26, 2018 at 10:15 PM, Pete Wright <pete at nomadlogic.org> 
wrote:
> 
> 
> On 12/23/18 3:41 PM, Manish Jain wrote:
>> Hi,
>> 
>> I have a port mkdesktop which simplifies the task of FreeBSD desktop 
>> configuration. I was looking to enhance the port in its 
>> capabilities and it would help me if I could know the various pkg's 
>> and kld's needed by the various chipsets.
>> 
>> As per my (incomplete) knowledge, the following are usually needed:
>> 
>> Chipset   | <Packages>                 | <Modules>
>> 
>> AMD GPU   | drm-kmod:xf86-video-amdgpu |
>> Radeon    | drm-kmod:xf86-video-ati    | radeonkms.ko**
>> NVidia    | drm-kmod:nvidia-driver     | nvidia.ko:nvidia-modeset.ko
>> Intel GPU | drm-kmod:xf86-video-intel  |
>> 
>> (** : Radeon appears to need radeon.ko and radeonkms.ko under 
>> FreeBSD 11.x, and only radeonkms.ko in 12.0)
>> 
>> I doubt if the above table is entirely correct and complete.
>> Could someone please fill me in on the missing tidbits so that I can 
>> enhance my port (mkdesktop).
>> 
> 
> We've been trying to get the wiki in better shape in regards to AMD 
> GPU and Intel i915 graphics.  Here are two tables which should be 
> pretty up to date (although I suspect some of the newer CPU's need to 
> be added):
> 
> https://wiki.freebsd.org/Graphics/AMD-GPU-Matrix
> https://wiki.freebsd.org/Graphics/Intel-GPU-Matrix

Hi,

The AMD matrix is the opposite of up to date, it shows support ending 
at Sea Islands, while actually everything up to and including Polaris 
works perfectly with drm-kmod, even Vega works.

Some other things that are really important and should be mentioned on 
the wiki:

- radeonkms/amdgpu currently conflicts with the EFI framebuffer, have 
to use 'hw.syscons.disable=1' to disable it (and lose graphics output 
until the driver loads) as a workaround — 
https://github.com/FreeBSDDesktop/DEPRECATED-freebsd-base-graphics/issues/170
- amdgpu currently requires the following patch to unbreak OpenCL, 
Vulkan and Xwayland: 
https://github.com/FreeBSDDesktop/kms-drm/issues/33#issuecomment-422793245