A patch would be great.  There has been several cases where no option
to use AHCI mode available, or where a box seller would offer Linux as
an alternate boot option against Windows in RAID mode (on the mobo)
but could no longer provide Linux with their systems (without
additional costs for add-in raid controller).

On Fri, Nov 10, 2017 at 5:31 AM, Dennis Mungai [off-list ref] wrote:

That feature would be especially important on systems where the
BIOS/UEFI environment offers no option to toggle back the AHCI mode.
This "RAID" Intel features is also known as "Intel Premium RST mode"
on all current Clevo systems, and on such a platform (the Clevo
P751DM2-G, marketed by the likes of Schenker and Origin PC) is based
on this platform.

-Dennis.

On 10 November 2017 at 16:19, Christoph Hellwig [off-list ref] wrote:

quoted

On Thu, Nov 09, 2017 at 10:24:54AM -0800, David F. wrote:

quoted

It seems that Linux will not see any HD on Intel's 100 Series or newer
chipsets (Z170, etc.) when in RAID mode.  (typically these systems
have M2 NVMe devices ). This is problematic when wanting to use Linux
on the system without having to disable RAID and when on their with
Windows.   Maybe not a linux-raid issue, but is Linux RAID issue
within the kernel device support.

Dan (on Cc) posted some patches to support the awkwared so called
"RAID" mode (it really should be Intel landgrab mode) in the client
chipsets more than a year ago.

It needed a bit of a rework to be present as a fake PCIe root port
instead of the platform driver magic, so I wonder what happened to
it - Dan any chance to get back to it?

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