> On Thu, 2022-11-10 at 18:48 +0500, Roman Mamedov wrote:
> > On Thu, 10 Nov 2022 13:43:56 +0000
> > Patrick O'Callaghan <p...@usb.ve> wrote:
> > 
> > > I've just replaced an old Nvidia card with a newer AMD RX580 and am
> > > attempting to reconfigure my Windows VM. However I don't see the
> > > new
> > > card getting its own IOMMU group:
> > > 
> > > $ ls /sys/kernel/iommu_groups
> > > $
> > 
> > Looks like you don't have any IOMMU groups at all. Was GPU
> > passthrough working
> > before, on this exact system? Without OS reinstalls, kernel upgrades
> > and
> > without resetting the BIOS settings to defaults?
> > 
> 
> Passthrough was working with the Nvidia card, which did have its own
> IOMMU group. However it's been some time (months) since I last used it,
> so it's possible that something else has changed as I do update my
> system frequently (using Fedora dnf from standard repos).
> 
> Other than the GPU, all the hardware is identical, and I haven't
> touched any BIOS settings.
> 
> poc
> 

maybe the GPU swap caused the bios to revert to default settings, I suggest 
verifying it

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