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'