http://bugzilla.suse.com/show_bug.cgi?id=957923 http://bugzilla.suse.com/show_bug.cgi?id=957923#c6 --- Comment #6 from Michal Kubeček --- Created attachment 659510 --> http://bugzilla.suse.com/attachment.cgi?id=659510&action=edit collected dmesg after boot These were taken with two kernels: 3.12.49-1-default: evergreen-13.1 kernel, very similar to SLE12-SP1 GM 4.1.13-5-default: current Leap 42.1 update booted in three different setups: -noiommu: IOMMU disabled in UEFI/BIOS setup no suffix: IOMMU enabled, no iommu parameter on kernel command line -iommupt: IOMMU enabled, "iommu=pt" on kernel command line Observed behaviour: - with IOMMU disabled in UEFI/BIOS, both kernels boot, USB 3.0 ports work but USB 2.0 ports do not and neither does onboard Realtek 8168evl/8111evl network adapter (that's where the watchdog warning comes from) - with IOMMU enabled and no iommu parameter, 3.12.49 stops responding early in the boot (haven't investigated why) - with IOMMU enabled and no iommu parameter, 4.1.13 boots without any apparent problem; however, after some time (usually 12-60 hours), kernel log starts getting flooded by IO_PAGE_FAULT messages (I'll attach a sample in a moment) - with IOMMU enabled and iommu=pt parameter, there is no apparent problem; I'm not sure I ever tested this for long enough with kernel older than 4.0, however - kernel 4.4.rc3-1.1.g3d7391b (Kernel:HEAD from ~2 weeks ago) seems to behave the same way as 4.1.13 -- You are receiving this mail because: You are on the CC list for the bug.