I’m running Ubuntu 19.10 (which ships a version of X that has the commits that allow render offloading) on a Lenovo Thinkpad X1 Extreme with a 1050 Ti Mobile (driver version 440.26 off of Ubuntu’s “graphics-drivers” ppa: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa ). Render offload m…

Yes and no. Any external displays connected to the nvidia gpu don’t work in render offload mode, you’ll have to switch back to prime output mode for that. Any external displays connected to the igpu will work, though. Many modern notebooks have an USB-C connector with displayport capability which i…

Right, I am attaching a monitor to the laptop by connecting the laptop’s usb-c port to the monitor’s displayport input but it does not appear to work in offload mode, only in full-Nvidia mode.

That connector is connected to the nvidia gpu as seen in nvidia-settings, so it doesn’t work. Any other dp connectors?

After looking into it, it looks like for this model of laptop all the display outputs are wired to the discrete GPU. So it is not possible to render on the integrated GPU and then have the discrete GPU just pass the frame through to the monitor?

No, currently only nouveau implements the prime output sink feature. Still, it wouldn’t be possible or at least a good idea to combine this with render offload since then the nvidia gpu has to render, copy the picture to the igpu mem for composition, then copy it back to the nvidia vmem for display.…

@aplattner Also, great work on the current render offload stuff, I have found it very useful despite this limitation.

Is there an issue I could sign up for to get alerted when at least provisional version is available with output sink functionality? I had to revert back to using integrated GPU due to inability to resume properly on my thinkpad p1 (see if laptop lid is closed during suspend, "failed to set mode: N…

I wanted to chime in and add that adding the output sink support would be really helpful. Are there any plans/timeline to work on it?

I am also interested in “output sink support”. Are there any news? Also, to clarify, would this mean the Nvidia card would get powered down so my battery would last longer (and the laptop would be quiter, since the fan is always on with nvidia GPU on)?

Support external displays in render offload mode?

Graphics / Linux Linux

aplattner November 9, 2019, 12:07am 7

generix is right, output sink support is not yet available. But we know it’s an often-requested feature and we’re looking into what we can do to support it.

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Support external displays in render offload mode?

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