** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Committed

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  PCIe link speeds of 16 GT/s are shown as "Unknown speed"

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  sysfs shows the linkspeed of 16 GT/s devices as "Unknown", so the user can't 
actually see what speed it is capable of, or currently running at.

  [Test Case]
  For a PCIe device that supports 16 GT/s:

  $ cat /sys/devices/pci0000:80/0000:80:08.0/max_link_speed
  16 GT/s

  Cherry-pick an upstream commit that supports in-kernel decoding of 16 GT/s 
link speed

  [Regression Risk]
  Trivial fix that just adds an extra case in a switch statement w/ supporting 

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