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 On 12/01/18 17:38, Alex Williamson wrote: > On Fri, 12 Jan 2018 10:45:57 +0100 > "P. Pronk" <v...@pronk.nl> wrote: > >> 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. > 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
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