Ask Ubuntu Asked by Maxence on December 1, 2021
I have had troubles installing Ubuntu on a new computer with an MSI B450 board and a RYZEN 5 3600.
First tried with Ubuntu 20.04 then downgraded my stick to 18.04 but still unsuccessful at first.
I finally managed to do it with 2 different SO threads :
Unable to install Ubuntu 18.04 on AMD Ryzen 2500U with Radeon Vega 8 Gfx
I had to add to my grub : nosplash
nomodeset
noacpi=off
and from the latter thread iommu=off
Then I have been able to install UBUNTU 18.04 properly on my SSD.
Yet I have now to manually add iommu=off
when booting.. or Ubuntu will not launch and I will get a purple blank screen.
I guess I should tweak my GRUB for good.
Yet I am not even sure what IOMMU is for ? and if iommu=off
is the actual solution.. I have read Iommu was about the graphics (my graphic card is indeed an AMD Radeon 550 2GB).
I really don’t care the graphics as I bought this graphic card just to be able to connect a screen to the computer (I don’t play games). Yet I’d like to know if adding iommu=off
will somehow snowball to other parts of the computer / decrease performance or create instability whatsoever .
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