(In reply to Andy Furniss from comment #13)
> (In reply to Michel Dänzer from comment #12)
> > Created attachment 107391 [details] [review] [review] [review]
> > Make Mesa behave as if the kernel was older

> > The attached patch makes Mesa behave the same with current kernels as it
> > does with older ones which don't have the bisected commit. Does that avoid
> > the problem?
> 
> No, the patch makes no difference.

It seems I wasn't testing it - so the answer now is yes it does - in fact the
goods I get with it on current kernels are better = less stutters than the
goods I saw during the kernel bisect.