Same appears on Ubuntu 14.04 and 16.04 on PICO500 board.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
# SMBIOS implementations newer than version 2.8 are not
# fully supported by this version of dmidecode.
5.11
# SMBIOS implementations newer than version 2.8 are not
# fully supported by this version of dmidecode.
02/21/2017

BIOS appears to be AMI based and the error message is like this:

[ 2219.629654] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.629766] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.629845] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.629963] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.630054] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.633358] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.633461] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.633561] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.636845] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.636967] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.637056] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.641516] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.641643] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.641753] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.641859] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.641973] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.642113] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.642208] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.651457] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.651581] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.657631] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?
[ 2219.657792] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 4 ep 4 with no 
TDs queued?

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https://bugs.launchpad.net/bugs/1541997

Title:
  dmesg flooded with xhci_hcd warnings "WARN Event TRB for slot 1 ep 8
  with no TDs queued?"

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