That parameter helped me as well with amdgpu long ago, only with a certain kernel version. Probably some kind of regression.
At the time I found and read some information about it, you'll find a lot of info on the internet. I remember the more complete and clear information was in the gentoo wiki.
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I don;t understand how enabling the soft mode on the iommu tables would matter because we aren't doing any virtualization. LoL. If it works who cares, LOL
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Because Input Output Memory Management Unit is not only about Virtualization. See e.g.:
https://wiki.gentoo.org/wiki/IOMMU_SWIOTLB
"These kinds of terms are used across the Enterprise area of computing, particularly the Virtual-Machine sector but they can be used by anyone running a Linux kernel"
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I plan on doing some research on the topic but for now this was great, I just have to do some housekeeping on my install rn.
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