Hi, Sorry, I missed this bit:
> I've just tried on another machine, which uses nouveau instead of > the nvidia driver, and I cannot reproduce the issue. Does that machine have the very same packages (e.g. both are an up-to-date sid), same cairo version, same configs (I know this one's impossible to tell)? If not then it could be purely a coincidence. But I tend to more and more suspect the nvidia driver at this point. cheers, e.