Comment 1 for bug 303011

That error message should probably only include the error string if ret != 0. I'm guessing that ret == 0 for you and you've got the same 945 setup we've got, where the cpu's interleaving makes swappable tiled objects (basically) impossible. To allow tiling on those systems we'll have to either play some tricks with the memory allocation and pin them, or get a lot more integrated into the paging system.