Comment # 102
on bug 110674
from Tom B
> Grasping at straws a bit here, but it occurred to me that maybe Linux kernel testing on Radeon VII was done on an early VBIOS that didn't have full UEFI support yet. We know that AMD had to issue a VBIOS update for Radeon VII to fix UEFI support shortly after the launch. So maybe enabling the CSM/Legacy Support in the BIOS, which does impact early GPU initialization, might have some effect on the multimonitor problem? Something I plan to test, but I wanted to share the idea in case someone else has a chance first.
I had already tried that unfortunately, I tried the following BIOS options:
CSM on/off
IOMMU on/of
PCIE speed 16x/4x (the only options my motherboard allowed for some reason)
Having said that, I didn't try booting using grub in BIOS mode as I didn't
want to change my partition table, so it's possible that although I had used
CSM, it was only legacy support and still booting in UEFI mode.
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