Why do some graphics drivers cause xruns?

[audiodef]

I might be using the wrong subject line due to a lack of understanding, but I would appreciate help understanding.

So here's what I want to know:

I have a computer that functions as my primary digital audio workstation. It runs Gentoo Studio and uses JACK. If I go with the bare-bones defaults and let Xorg handle everything, using Nouveau/nv drivers - which is the default for Gentoo Studio - I get many xruns, often two per second. If I downgrade rt-sources to 4.9 and emerge nvidia-drivers - I forget the version but it works with rt-sources 4.9 - and eselect opengl to this driver, I never get xruns even at a latency of 5 ms.

Note that rt-sources 4.9 and Nouveau/nv causes xruns, so I'm ruling out the kernel sources as the culprit. I think - I dunno, I'm not an expert at this aspect of things.

Also note that this applies to Nvidia graphics. I have the same installation of Gentoo Studio on machines not using Nvidia and this is not an issue.

So what is it about using the open-source Nvidia drivers that causes xruns where using the proprietary driver does not?
_________________
decibel Linux: https://decibellinux.org
Github: https://github.com/Gentoo-Music-and-Audio-Technology
Facebook: https://www.facebook.com/decibellinux
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[krinn]

-> https://www.alsa-project.org/main/index.php/XRUN_Debug
(sorry can't do better)

[audiodef]

Thanks, krinn. I know nothing about how this works, so I wouldn't know what to do with this info. But I'm bookmarking it in case it's useful in my search for edification. Appreciate it.

EDIT: I came across at least one post elsewhere mentioning that open-source nvidia drivers cause xruns, so it's not quite a case of something funny on one particular system.
_________________
decibel Linux: https://decibellinux.org
Github: https://github.com/Gentoo-Music-and-Audio-Technology
Facebook: https://www.facebook.com/decibellinux
Discord: https://discord.gg/73XV24dNPN