<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Alex, thank you for your advice. I checked the ubuntu kernel build logs and I couldnt find differences in build config for the pci-stub, vfio-pci and amdgpu modules or the build method in general. Your next advice of adding the softdep workaround does seem to work. Not sure if its related (probably not), but I was also able to remove the stub/vfio kernel parameters in grub and now only have the vfio-pci ids and the softdep listed in modprobe.d/vfio-pci.conf (for others coming across this, dont forget to update your initramfs after adding the softdep line). I am still not sure why adding the softdep is necessary in v4.14.10+ btw, maybe its something ubuntu specific but at least its working again :) Cheers, Pim <div class="moz-cite-prefix">On 12/01/18 17:38, Alex Williamson wrote: </div> <blockquote type="cite" cite="mid:20180112093857.768f52b2@t450s.home"> <pre wrap="">On Fri, 12 Jan 2018 10:45:57 +0100 "P. Pronk" <a class="moz-txt-link-rfc2396E" href="mailto:vfio@pronk.nl"><vfio@pronk.nl></a> wrote: </pre> <blockquote type="cite"> <pre wrap="">Thanks for the tips, swapping the cards is not an option as I use a uatx board but also use all the other pcie ports which would be blocked by the rx480 otherwise. Adding the vfio-pci module to initramfs doesnt make any difference unfortunately. You cant set which gpu is the primary on an Asus board. It just uses the one in the first pcie slot and you have no other choice, thats why I said I made a mistake buying Asus ;) But everything works as intended in v4.14.9, it 'just' doesnt anymore since v4.14.10 @Alex, do you maybe have any suggestions? Unfortunately I am having some difficulties understanding the changelog of kernel v4.14.10 and their possible impact on my problem. </pre> </blockquote> <pre wrap="">Both pci-stub.ids and vfio-pci.ids require that the pci-stub or vfio-pci driver are loaded before the potentially conflicting driver. Did your kernel perhaps change pci-stub from a builtin driver to a module between these releases? You could possibly use a softdep to get vfio-pci loaded before amdgpu, something like softdep amdgpu pre: vfio-pci in modprobe.d. Thanks, Alex </pre> </blockquote> </body> </html>