[PATCH 08/36] xfree86: add platform bus hotplug support (v2)

[Dave Airlie]

On Mon, Jul 2, 2012 at 10:31 PM, Keith Packard <keithp at keithp.com> wrote:
>
> Dave Airlie <airlied at gmail.com> writes:
>> No they can all do it, just haven't the code to do the picking yet of
>> a driver, and since
>> USB is really the only thing I can hotplug so far.
>
> It seems like more driver ABI changes would be required to let them know
> about the new device then?

No the drivers will just have to be able to accept the udev entry
point with the GPU screen flag.

no further changes needed, granted I've no idea what drivers other
than modesetting will ever do proper hotplug,
I suppose I could get a real PCIE dock at some point and hotplug
radeon or nouveau, but there is a lot of work
kernel side before we could even start on the userspace drivers.

with dual-gpu machines even if we power off the discrete we never
"unplug" it, its all abstracted in the kernel.

Dave.