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[Launchpad Bug Tracker <1494593@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/linux-lts-vivid

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https://bugs.launchpad.net/bugs/1494593

Title:
  Marvell's W8897 WLAN/BT combo card doesn't work from time to time

Status in HWE Next:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed

Bug description:
  On cold boot, the W8897 sometimes won't work. And even if it works,
  the card would fail after reboot. Even more, sometimes it would
  vanished from PCI bus.

  There's a race between mwifiex_pcie and mwifiex_usb which causes this
  issue. Currently as a workaround we can blacklist mwifiex_usb. Marvell
  is still working on a solution.

  PCI ID:
  02:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. Device [11ab:2b38]

  USB ID:
  Bus 001 Device 003: ID 1286:2045 Marvell Semiconductor, Inc.

  And the info in dmesg:
  [ 7.561183] mwifiex: rx work enabled, cpus 8
  [ 8.726729] mwifiex: rx work enabled, cpus 8
  [ 8.727110] usbcore: registered new interface driver mwifiex_usb
  [ 8.796120] usb 1-6: info: FW download over, size 0 bytes
  [ 8.796123] usb 1-6: info: mwifiex_fw_dpc: unregister device
  [ 9.361595] mwifiex_pcie 0000:02:00.0: info: FW download over, size 759128 bytes
  [ 19.760514] mwifiex_pcie 0000:02:00.0: PCI-E is not the winner <0xffffffff,1>, exit dnld
  [ 19.760519] mwifiex_pcie 0000:02:00.0: FW failed to be active in time
  [ 19.760522] mwifiex_pcie 0000:02:00.0: info: mwifiex_fw_dpc: unregister device

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