system boots extremely slow with AMD R9 GPU

[Xen]

compdoc schreef op 10-03-2017 17:40:
> On 03/10/2017 12:55 AM, Xen wrote:
> 
>> my Linux system boots very slowly when I have inserted a AMD R9 380 
>> graphics card.
> 
> There is a bios setting that some boards have named PCI Latency Timer.
> Make sure this is set to 32.

Right, I will check. (Maybe I changed it?).

> And there are settings for UEFI vs legacy video.

BIOS motherboard.

> Also, do you have the proper 8-pin power cable connected to the card?

Yeah.

Maybe it was just an USB thing but I can't tell. Both kernels suddenly 
boot alright. Prior, I have done at least 8 reboots and every time it 
was the same thing. So perhaps they were BIOS settings after all, thank 
you, I will check later.