Current support and roadmap for discrete graphics card hot switching

[Albert Vilella]

How about a "gdm restart"? That is effectively an X server restart, right?

Then it's only about switching on and off the hardware, right?

On Thu, Jan 15, 2009 at 7:20 PM, Glynn Clements <glynn at gclements.plus.com>wrote:

>
> Stephane Marchesin wrote:
>
> > and if you want to keep your session in between, we lack
> > - X.Org infrastructure to hand a session from a graphics driver to
> > another (there are a million of possible problems here)
>
> Right; like a million display parameters which a client can query, but
> for which there is no mechanism to request notification of changes,
> and thus are (implicitly) constant over the lifetime of the client.
>
> I know that the X developers don't consider incompatible changes to be
> completely out of the question, but if you're talking about a
> particular screen suddenly changing e.g. its glGet* values, I don't
> see that happening.
>
> And I don't think that it's realistic for the server to expose a
> single set of parameters for two very different graphics chips.
>
> It's more realistic to treat this as a traditional multiple-"Screen"
> setup, with the ability to enable and disable screens. Obviously,
> windows would have to either be opened on the appropriate screen
> (programs which need the 3D GPU on the screen which has one), or the
> application/toolkit would need to explicitly provide migration.
>
> --
> Glynn Clements <glynn at gclements.plus.com>
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