Bug#931984: linux-image-4.19.0 : Radeon : The kernel cannot reserves memory video. Fixed in 5.

[alain Rpnpif]

This bug was fixed. It does not exist in linux-image-5.4.0-1-amd64 (from 
sid) that works fine.

It still exist in linux-image-5.0 from Ubuntu.
So please, fix it in linux-image-4.19.

Regards

Alain Rpnpif