> On Sun, Jan 13, 2019 at 11:00 AM Lorenzo Bianconi > <lorenzo.bianconi@xxxxxxxxxx> wrote: > > > > > > > > > > > On Sun, Jan 13, 2019 at 5:33 AM, Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx> wrote: > > > > > > Direct. No VM used. This is the only peripheral causing this issue. > > > > > > Is the device connected to a usb3.0 port? If so, could you please try to connect the dongle to a 2.0 one? > > > > > > I tried through a USB 2.0 port. Shouldn't make a difference as they both use the xhci driver. > > > > > > > mt76x2u supports scatter-gather on usb 3.0 (not on 2.0) > Tried a USB 3 port. Same result. > > > > > Could you please double check if IOMMU is enabled? > > > > > > > Have you tried to disable it? Does it make any difference? > No idea how. UEFI doesn't seem to show anything similar. > > Similar bug report: https://bugzilla.kernel.org/show_bug.cgi?id=202241 You should be able to disable iommu using GRUB_CMDLINE_LINUX in /etc/default/grub (I guess setting iommu=off and reinstalling grub) https://wiki.gentoo.org/wiki/IOMMU_SWIOTLB Regards, Lorenzo
