drm: Primary display is recognized as secondary display

[Chris Wilson]

On Sat, May 20, 2017 at 10:02:32PM +0900, Hisao Tanabe wrote:
> DELL 27-inch display is connected to ThinkPad 250 via DisplayPort cable,
> and DELL 27-inch display is used as primary display.
> 
> After upgrade kernel from 4.10 to 4.11, the DELL 27-inch display is now
> recognized as a secondary display.

What's primary and secondary? Do you mean X's RandR PrimaryOutput, or
the layout, both of which are provided by userspace. I suspect what you
mean is that the connectors were relabelled, so the output from
before/after xrandr might help to clarify that.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre