PRIME Synchronization Is Still Being Worked On To Fix Tearing

[phoronix]

Phoronix: PRIME Synchronization Is Still Being Worked On To Fix Tearing

A NVIDIA developer has posted two updated patches for PRIME synchronization with the Intel DRM driver to hopefully fix tearing when using PRIME GPU sharing...

http://www.phoronix.com/scan.php?page=news_item&px=PRIME-Sync-Tearing

[Kano]

Seems to be a good idea as watching movies with active Optimus is not that optimal.

[yzsolt]

Nice, but won't benefit the AMD drivers from this too?
Also interesting to see that this work is done by an NVIDIA employee. I only saw them investing in mobile related things, not in fixing desktop bugs.

[Kano]

You can use on demand switching with mesa but Nvidia uses
xrandr --setprovideroutputsource modesetting NVIDIA-0

[haagch]

So.. should this work with dri3? Because on intel+radeonsi with dri3 playing a game looks like this: https://www.youtube.com/watch?v=HVDZowUGlSc (the shadows flickering have been fixed, the "frame jumping" is the synchronization problem).
So I second the question: Does this already work with radeon?

[andre30correia]

So.. should this work with dri3? Because on intel+radeonsi with dri3 playing a game looks like this: https://www.youtube.com/watch?v=HVDZowUGlSc (the shadows flickering have been fixed, the "frame jumping" is the synchronization problem).
So I second the question: Does this already work with radeon?

i think it only use v sync with wayland, with X the tearing is horrible (talking about august experience)

[RussianNeuroMancer]

So I second the question: Does this already work with radeon?

For Radeon iGPU+dGPU with FOSS driver there is no tearing for few years. There was this issue https://bugs.freedesktop.org/show_bug.cgi?id=56659 but it's fixed now.

[haagch]

Well, with a quick test with glxgears I can say: No, it does not work with dri3 offloading: https://www.youtube.com/watch?v=D1zTqjmisKk (At least in the bugtracker people said this happens because of the same lack of synchronization)

[Vash63]

Nice, but won't benefit the AMD drivers from this too?
Also interesting to see that this work is done by an NVIDIA employee. I only saw them investing in mobile related things, not in fixing desktop bugs.

This is a desktop bug that affects their proprietary driver though. That's an exception they've made for a while.

[sarmad]

Is PRIME supported under Wayland? If so, how can Wayland ensuare a "perfect frame" with PRIME not supporting v-sync?