Bug#908632: linux-image-4.19.0-rc3-amd64-unsigned: kernel 4.19 fails to load amdgpu driver on R9 270X.
Tested again with experimental kernel 4.19-rc4 and the result is the same (not able to find firmware) as with 4.19-rc3
and 4.19-rc2.
Tried reinstalling the firmware-amd-graphics and firmware-linux packages.
Booting with kernel parameters 'radeon.si_support=0 amdgpu.si_support=1' and kernel 4.19.rc-4 the system bails and
cannot find the required firmware which is located at '/lib/firmware/radeon'.
If I copy the contents of '/lib/firmware/radeon' to '/lib/firmware/amdgpu' and restart, the system boots, loads the
firmware and works.
Since previous kernels (4.17, 4.18) the system had no problem finding the correct firmware inside '/lib/firmware/radeon'
when using amdgpu driver.
On 9/13/18 1:44 PM, felipe wrote:
> Today I had some spare time and I did some tests.
>
> On kernel 4.17 and 4.18 I can switch from radeonsi to amdgpu using/removing 'radeon.si_support=0 amdgpu.si_support=1'
> and the system finds and loads the relevant firmware in /lib/firmware/radeon, giving this system a boost in performance,
> correct HDMI output and no crashes.
>
> Booting kernel 4.19, the system could not load the relevant firmware when I tried to use amdgpu, but booted using radeonsi.
>
> Today I did copy all the firmware in '/lib/firmware/radeon' to '/lib/firmware/amdgpu' and the system booted in a working
> state and has been stable for the last hour.
>
> Since it is possible to use amdgpu with older GCN cards, the kernel should also look for the firmware inside
> '/lib/firmware/radeon' when using 'amdgpu' driver.
>
>
> '$ cat /var/log/syslog' of this working session with kernel 4.19-rc3 and 'cp /lib/firmware/radeon/* /lib/firmware/amdgpu'
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