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Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs

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On Fri, 2016-12-09 at 16:06 +0100, Ferdinand Pöll wrote:
> Package: linux-image-4.9.0-rc8-amd64-unsigned
> Version: 4.9~rc8-1~exp1
> Severity: wishlist
> Tags: patch
> 
> Dear Maintainer,
> 
> I have an AMD Radeon R9 270X and I'd like to use the new amdgpu driver with it.
> Since 4.9, linux includes experimental support for GCN 1.0 VGAs, but it's not
> enabled in the debian builds as well as the support for GCN 1.1 cards (which
> isn't new in the kernel anymore). In the kernel build config, you just need to
> set CONFIG_DRM_AMDGPU_SI=Y (for GCN1.0-based cards) and CONFIG_DRM_AMDGPU_CIK=Y
> (for GCN1.1-based cards). To use amdgpu if it is built into the kernel with the
> old gpus users just need to blacklist radeon and upon the next reboot linux
> will load amdgpu and users can install amdgpu-pro if they want to or just stick
> with the newest free graphics driver.

I don't think this will work the way you expect.  kmod will load both
modules unless one of them is blacklisted, and it's not documented
which one will be tried first.  So we could end up loading amdgpu on
systems that should still be using radeon by default.

We could perhaps patch amdgpu so that it isn't auto-loaded for the GCN
1.0 GPUs.  But I'm not yet convinced this is worth doing.

Ben.

> The kernel in my system info below is built from source with the options
> mentioned above enabled.


-- 
Ben Hutchings
In a hierarchy, every employee tends to rise to his level of
incompetence.

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Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs Ferdinand Pöll <fphome@live.de> - 2016-12-09 16:10 +0100
  Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs Ben Hutchings <ben@decadent.org.uk> - 2017-01-05 04:30 +0100
    Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs Andreas Boll <andreas.boll.dev@gmail.com> - 2017-11-02 18:00 +0100
      Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs Ben Hutchings <ben@decadent.org.uk> - 2017-11-16 20:30 +0100
  Bug#847570: linux-image-4.9.0-rc8-amd64-unsigned: AMDGPU not build with support for GCN1.0 and GCN1.1 VGAs xsellier@gmail.com - 2017-08-26 15:50 +0200

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