Intel Driver Gains Virtual/Remote Output Support
Written by Michael Larabel in Intel on 31 August 2013 at 08:21 PM EDT. 11 Comments
The Intel X.Org driver has gained virtual output support to extend the local desktop with remote outputs. Simply put, this can help NVIDIA Optimus/Bumblebee users on Linux.

Chris Wilson explains this new feature well in the xf86-video-intel driver commit message:
intel-virtual-output utilizes local VirtualHeads to present a contiguous desktop to the local display manager, but maps the drawing on those outputs to the remote display, and provides bidirectional RandR proxy so that you can resize the remote display and configure it within your desktop. The remote display should also send hotplug events back to the local desktop, for reconfiguration on the fly.

Ideally the remote display is a discrete GPU on the same host so that we can use local Shared Memory transport and avoid sending data over the wire (though it will work in that setup). Ideally you would have userptr support to provide zero-copy rendering between the GPUs, or have dma-buf (in which case you would be using PRIME). For remote rendering, no compression is done so this fares worse than VNC.
Those wanting to explore the code can view it on Git. A follow-up commit made it so all outputs are cloned on the remote display. This feature will be present in the next Intel DDX driver release, which given Wilson's release rate for the driver, should mean it will arrive in a released version within a few days time.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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