[audidude]

Have a bug number? Link to the driver issues? I've worked on a lot of systems, including popular virtual machines display implementations (the most likely system to hit the SVGA mode) and have not seen this.

I have, however, seen compositors that hit buggy mesa llvmpipe paths corrupt the visual output on the way to the GPU. But that would have happened to Qt as well unless you ran the Qt app on a non-composited desktop (which wouldn't really be an apples-to-apples comparison).