When using the ax88179 connected via the via based card the whole system gets brought down after a while i got this my system log. I'm going to take a break and see if I can narrow anything more down tomorrow. This log is in reverse because of the wonderful way journalctl works. I suppose I could try using iommu=pt as a kernel boot parameter but that doesn't sound like a safe thing to do. Jan 30 21:04:38 athas kernel: [<ffffffffc11281a0>] xhci_msi_irq [xhci_hcd] Jan 30 21:04:38 athas kernel: handlers: Jan 30 21:04:38 athas kernel: [<ffffffffa74f9ee6>] system_call_fastpath+0x1a/0x1f Jan 30 21:04:38 athas kernel: [<ffffffffa715ef6a>] ? SyS_epoll_ctl+0x4fa/0xb00 Jan 30 21:04:38 athas kernel: <EOI> [<ffffffffa715f181>] ? SyS_epoll_ctl+0x711/0xb00 Jan 30 21:04:38 athas kernel: [<ffffffffa74f982a>] common_interrupt+0x6a/0x6a Jan 30 21:04:38 athas kernel: [<ffffffffa700445a>] do_IRQ+0x4a/0xf0 Jan 30 21:04:38 athas kernel: [<ffffffffa7004679>] handle_irq+0x19/0x30 Jan 30 21:04:38 athas kernel: [<ffffffffa708200f>] handle_edge_irq+0x6f/0x120 Jan 30 21:04:38 athas kernel: [<ffffffffa707f8b1>] handle_irq_event+0x31/0x50 Jan 30 21:04:38 athas kernel: [<ffffffffa707f802>] handle_irq_event_percpu+0xc2/0x140 Jan 30 21:04:38 athas kernel: [<ffffffffa7081b00>] note_interrupt+0xe0/0x1e0 Jan 30 21:04:38 athas kernel: [<ffffffffa708176d>] __report_bad_irq+0x2d/0xc0 Jan 30 21:04:38 athas kernel: <IRQ> [<ffffffffa74efd3f>] dump_stack+0x45/0x56 Jan 30 21:04:38 athas kernel: Call Trace: Jan 30 21:04:38 athas kernel: 0000000000000000 ffff88043edc3ed8 ffffffffa7081b00 0000000000000000 Jan 30 21:04:38 athas kernel: ffff88043edc3e98 ffffffffa708176d ffff880425031b00 000000000000004d Jan 30 21:04:38 athas kernel: ffff880425031b84 ffff88043edc3e70 ffffffffa74efd3f ffff880425031b00 Jan 30 21:04:38 athas kernel: Hardware name: To be filled by O.E.M. To be filled by O.E.M./M5A99FX PRO R2.0, BIOS 2201 11/22/2013 Jan 30 21:04:38 athas kernel: CPU: 7 PID: 1160 Comm: Chrome_IOThread Not tainted 3.13.0+ #13 Jan 30 21:04:38 athas kernel: irq event 77: bogus return value ffffff94 Jan 30 21:04:38 athas kernel: xhci_hcd 0000:02:00.0: Host not halted after 16000 microseconds. Jan 30 21:04:38 athas kernel: AMD-Vi: Event logged [IO_PAGE_FAULT device=02:00.0 domain=0x0019 address=0x00000000002b2000 flags=0x0000] Jan 30 21:04:38 athas kernel: xhci_hcd 0000:02:00.0: WARNING: Host System Error Regards, Will Trives -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html