AMD boot error - correct : Radeon 290

And the funny thing : Debian9 was running on this Dell PC on Qubes OS without boot error !

AMD boot error - correct : Radeon 290

Hello can you explain me why deb9 setup is not possible with AMD grafic card Radeon 290 ? and why there is in pre config no warning that this card is not supported? why ? I am frustrated to use a modern system , which then does not boot. normally the open box has to start , but there is