Disclaimer, this was done on a backport to -stable.

Works fine on intel (modesetting driver), testing with glxgears and mpv
I get some nasty frame-timing issues with the glx backend (doesn't
matter if vsync is enabled or not). Using the --no-frame-pacing flag
sort of fixes this, as well as using the xrender backend (which I prefer
using anyways since it seems to perform better). This could very well
likely be an upstream issue, but I'm giving a heads up here anyways.