[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #149 from alvarex <edisonalvarez at arnet.com.ar> ---
I forgot to mention I had a similar problem on Windows also with a 260x on the
same motherboard so I think in my case is something to do with the motherboard.
I tried modyfing some option in grub but that did't help, I added

iommu=pt acpi_osi=Linux acpi=force acpi_enforce_resources=lax
acpi_osi='!Windows 2013' acpi_osi='!Windows 


The iommu table is bugged on this motherboard maybe it has something todo? If I
disable iommu completely on the bios usb devices will not power up.

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