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[Bug 1358498] Re: ahci-xgene falsely advertises NCQ support


This fix should flow naturally into utopic via stable. The driver isn't
in upstream 3.13 stable, and the flag code has changed since, so trusty
requires some backporting.

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  ahci-xgene falsely advertises NCQ support

Status in “linux” package in Ubuntu:

Bug description:
  ahci-xgene doesn't support NCQ but it sets this flag. This causes SATA failures that surface as a filesystem being remounted read-only due to errors when using a disk that supports NCQ.
  Do a network boot install on an X-Gene system with an SSD drive that supports NCQ. The install will fail and dmesg will show the filesystem being remounted read-only.
  [Regression Potential]
  Minimal; we're turning off a feature that is known broken.

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