On 14/01/2019, Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx> wrote: >> 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 > updating grub, not reinstalling
