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  Dell XPS 9360 wifi 5G performance is poor

Status in HWE Next:
  Fix Released
Status in HWE Next xenial series:
  Fix Released
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released

Bug description:
  TX throughput is not good in Ubuntu in IEEE 802.11ac mode.

  Measured Rx 60Mbit/s and Tx 12Mbit/s with Ubuntu
  Windows 10 (1607) performs much better with on transmit side Rx 73MBit/s and 
Tx 62MBit/s using the same hardware setup.
  Same result with WPA2 disabled in unencrypted mode.

  Steps to Reproduce:
  1. connect to Wifi
  2. copy a large file from XPS 13 to a share on a 2nd system

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