Public bug reported:
With 16.04 and an AsRock Fatal1ty Z170 motherboard, I cannot seem to
connect USB3 devices to USB3 ports. They work if I plug them into a USB2
port. Also, USB2 devices work if plugged into a USB3 port.
I have read other descriptions of similar phenomena, but typically, USB3
does not work initially, but it is fixed by enabling the IOMMU setting
in the BIOS. Unless I'm missing it, I don't seem to have such a setting.
I do have "xhci handoff", and I have enabled that.
Excerpt from `lspci -k`:
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI
Controller (rev 31)
Subsystem: ASRock Incorporation Sunrise Point-H USB 3.0 xHCI Controller
Kernel driver in use: xhci_hcd
...and `dmesg | grep -e DMAR -e IOMMU`
'''
[ 0.000000] ACPI: DMAR 0x0000000087F59300 000070 (v01 INTEL SKL
00000001 INTL 00000001)
[ 0.101242] DMAR: Host address width 39
[ 0.101243] DMAR: DRHD base: 0x000000fed90000 flags: 0x1
[ 0.101248] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap d2008c40660462
ecap f050da
[ 0.101249] DMAR: RMRR base: 0x00000087555000 end: 0x00000087574fff
[ 0.101250] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed90000 IOMMU 0
[ 0.101251] DMAR-IR: HPET id 0 under DRHD base 0xfed90000
[ 0.101251] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[ 0.101252] DMAR-IR: Use 'intremap=no_x2apic_optout' to override the BIOS
setting.
[ 0.102531] DMAR-IR: Enabled IRQ remapping in xapic mode
[ 0.820995] AMD IOMMUv2 driver by Joerg Roedel <jroe...@suse.de>
[ 0.820996] AMD IOMMUv2 functionality not available on this system
'''
I have also tried adding `iommu=soft` or `iommu=pt` to my kernel command
parameters, and this has not fixed the issue.
I have asked a question about this matter on AskUbuntu, but after two
weeks, there has been no activity.
https://askubuntu.com/questions/815416/usb3-devices-not-working-when-
plugged-into-usb3-port
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1621598
Title:
USB3 devices not working when plugged into USB3 port
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