Current support and roadmap for discrete graphics card hot switching

[Stephane Marchesin]

On Thu, Jan 15, 2009 at 15:13, Alan Cox <alan at lxorguk.ukuu.org.uk> wrote:
>> Right, which reduces it to a simple power management issue akin to
>> powering down the 3D core on any modern chipset when you're not doing
>> any rendering.
>>
>> Adding different devices with separate drivers is another matter
>> altogether.
>
> Isn't dual driver support logically equivalent to xrandr mirrored to both
> with either one or the other currently a 'switched away' vt ?

Yeah, in a perfect world it is. But :
- cross-card xrandr doesn't exist
- not all drivers support xrandr + EXA which shatter will require to
achieve cross-card xrandr
- that also assumes the drivers power down the chip while switched away

Stephane