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Bug 646672

Summary: In-kernel Nouveau causes xruns with rt kernel
Product: Gentoo Linux Reporter: Audiodef <online>
Component: Current packagesAssignee: Default Assignee for New Packages <maintainer-wanted>
Status: UNCONFIRMED ---    
Severity: normal CC: proxy-maint
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Package list:
Runtime testing required: ---

Description Audiodef 2018-02-05 14:21:28 UTC
I know rt-sources are not supported by Gentoo in any way, so I'll accept a "no thanks" in good cheer. But this is a note about Nouveau, not rt-sources. When I use the in-kernel Nouveau drivers, I get a steady stream of xruns from JACK, about two per second. I have confirmed another user I support with the same issue. The issue disappears (few to no xruns) when we stop using the Nouveau driver and switch to nvidia-drivers. 

Steps to reproduce:
1. Have an Nvidia card
2. emerge rt-sources
3. genkernel all
4. Run JACK (qjackctl or Cadence)
5. Note xruns

Switching to nv results in fewer xruns, however, the number of xruns is still unacceptable in this case, and is clearly tied to graphic events on-screen.

This issue does not exist when the video card is something other than Nvidia.