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Old 07-02-2018, 03:29 PM   #1
Registered: Oct 2005
Posts: 69

Rep: Reputation: 15
Not all USB Ports working

I have a unit with an ASRock N68-VS3 FX mainboard which previously had Win7 and all USB ports worked.
As the Hard disk died I have put a new SSD in and installed Debian 9 but not all the USB ports work.

All the ports ports on the back port work and if I plug a USB to serial adaptor into each port (just the one port at a time) and monitor with udevadm monitor I get
add /devices/pci0000:00/0000:00:02.0/usb2/2-1/2-1:1.0/ttyUSB0 (usb-serial)
add /devices/pci0000:00/0000:00:02.0/usb2/2-2/2-2:1.0/ttyUSB0 (usb-serial)
add /devices/pci0000:00/0000:00:02.0/usb2/2-3/2-3:1.0/ttyUSB0 (usb-serial)
add /devices/pci0000:00/0000:00:02.0/usb2/2-4/2-4:1.0/ttyUSB0 (usb-serial)

And the computer case ports connect to one of the USB Header also work ok
add /devices/pci0000:00/0000:00:02.0/usb2/2-5/2-5:1.0/ttyUSB0 (usb-serial)
add /devices/pci0000:00/0000:00:02.0/usb2/2-6/2-6:1.0/ttyUSB0 (usb-serial)

But There is an adapter plate to the other USB header and only one appears to work.
add /devices/pci0000:00/0000:00:02.0/usb2/2-8/2-8:1.0/ttyUSB0 (usb-serial)

When I unplugged and re-seated the non working adapter connector it started working but respond with one of the already reported in use ones, which when I checked that original back plate port had stopped working until I rebooted...
add /devices/pci0000:00/0000:00:02.0/usb2/2-4/2-4:1.0/ttyUSB0 (usb-serial)

I did try the GRUB_CMDLINE_LINUX="iommu=soft" change but this did not seem to make any difference

further info.

# uname -a
Linux Unit180522 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU/Linux

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Any suggestions on what the issue(s) could be and what to look into?
Old 07-03-2018, 01:00 PM   #2
Registered: Oct 2005
Posts: 69

Original Poster
Rep: Reputation: 15
sorry for the noise, looks like (and hoping) it was a connector getting bumped while removing old HDD and or fitting new SSD. They still seemed well seated, but I swapped the connectors around (front of case and bracket on back and now all four are working.
Old 07-03-2018, 03:02 PM   #3
Registered: Mar 2008
Posts: 19,512

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Thanks for the update and solution.


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