Currently in X, it is possible to have a multi-monitor setup across several GPUs. A fairly typical use case is three or more monitors shared between a consumer graphics card and an onboard APU/iGPU/<insert marketing jargon here>. I understand this may have been on the todo for some time, but it'd be nice to have a ticket to track progress.
Yeah, whilst Mutter does it, it's not something we've had the developer time to deal with. I don't know that it's on anyone's radar, nor when we could expect to see it.
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