[RFC] drm + i915 DP MST code preview

Chris Wilson chris at chris-wilson.co.uk
Fri May 2 01:52:06 PDT 2014

On Fri, May 02, 2014 at 02:39:37PM +1000, Dave Airlie wrote:
> Hi,
> Branch: http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-support
> Okay I've gotten this to light up some monitors using -modesetting so it
> must be ready for an initial posting,

I see that connectors are added/removed dynamically based on branch
discovery, but I haven't spotted how that is communicated to userspace.
I was expecting to see a new uevent. Or do you simply want userspace to
update it lists of connectors on every hotplug event? Is there anyway to
retrieve the guid so that we can associate the same XID to each branch
device for the server lifetime? (Is that even a sane idea?) Can we
detect when a DP dongle is present splitting DVI/VGA using MST but since
they use different encoders they already falsely appear as unique
connectors to i915.ko?

Chris Wilson, Intel Open Source Technology Centre

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