---
- branch: MAIN
  date: Mon Jan 13 21:20:17 UTC 2020
  files:
  - new: '1.454'
    old: '1.453'
    path: src/sys/dev/ata/wd.c
    pathrev: src/sys/dev/ata/wd.c@1.454
    type: modified
  id: 20200113T212017Z.99edd210b2ca183f3cd541c7ad304949bb19fdc7
  log: |
    disable NCQ by default for "Samsung SSD 860 EVO 1TB" and
    "Samsung SSD 860 EVO 500GB" - these drives have known broken NCQ support
    particularly when used with AMD SB710/750 chipsets, problem occur also
    under Linux and Windows

    https://eu.community.samsung.com/t5/Cameras-IT-Everything-Else/860-EVO-250GB-causing-freezes-on-AMD-system/td-p/575813
    https://bugzilla.kernel.org/show_bug.cgi?id=201693

    It seems there is no Samsung firmware update to fix this even.

    Disable NCQ regardless of the controller, it's likely same problem
    exists with other controllers too.

    This should fix PR kern/54790 and PR kern/54855
  module: src
  subject: 'CVS commit: src/sys/dev/ata'
  unixtime: '1578950417'
  user: jdolecek