I'm RAOF, maintainer of the Ubuntu PPA mentioned earlier. I've recently changed the libdrm package in my PPA to produce a module-assistant using drm-modules-source package, which might make inclusion in experimental a bit easier. Speaking with upstream, they very much do not want the 3d portion shipped at all, anywhere. It doesn't just need a git snapshot of mesa, it needs a git snapshot of a branch of the experimental gallium-0.1 branch of mesa. Accordingly, I don't ship the 3d portion in my PPA, and it would be courteous to not ship it in experimental. I'd be happy to help push to experimental, but I don't currently have a bare-metal Sid install, so driver testing is a little difficult!
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