I'm using the default that comes with 18.04 uname -svr Linux 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:58:14 UTC 2018
The same IOMMU=pt
$ grep iommu /etc/default/grub GRUB_CMDLINE_LINUX="iommu=pt"
Fixed 4.14.* on 17.10 (I didn't try the default 4.13.* kernel) Last tested on 4.14.33-041433-generic (I don't boot 17.10 that often)
I'm using the default that comes with 18.04
uname -svr
Linux 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:58:14 UTC 2018
The same IOMMU=pt
$ grep iommu /etc/default/grub LINUX=" iommu=pt"
GRUB_CMDLINE_
Fixed 4.14.* on 17.10 (I didn't try the default 4.13.* kernel) 041433- generic (I don't boot 17.10 that often)
Last tested on 4.14.33-