> Hi. > Im trying to set intel_iommu=on on kernel parameters at grub but for > some reason it doesnt work. > > I edit /etc/default/grub file and i add the parameter. > > then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then i > reboot. When you look at /boot/efi/EFI/centos/grub.cfg, do you see that the parameter has been added? Regards, Simon