It certainly used to work fine with llvmpipe; I tested it when it first came out and it worked with no problems. Was pretty fast, too; it wasn't crippled by it

It certainly used to work fine with llvmpipe; I tested it when it first came out and it worked with no problems. Was pretty fast, too; it wasn't crippled by it though the stress tests (that do horribly in Firefox and Chrome) didn't do that well in it either (of course). This may have changed and broken it on llvmpipe. In general we've not smoothed out this stuff so that you can fall back cleanly when a GPU doesn't exist.