Hi François
Please see the following links that might be useful:
https://doc.fedora-fr.org/wiki/Prime
https://doc.fedora-fr.org/wiki/Carte_graphique_ATI_-_AMD_Radeon_:_install...
In relation to a proprietary driver that would depend on the card you have. Can you tell
me what card you have? If you have an older card then the opensource driver is your only
option as I believe these older cards are only supported by the opensource driver. If you
have a new card then please see the following:
https://support.amd.com/en-us/kb-articles/Pages/AMD-Radeon-GPU-PRO-Linux-...
Regards John