Comment 39 for bug 1066410

It certainly looking like some kind of race condition when SSDs are involved. Adding a "sleep x" command doesn't help no matter how many seconds I tell it to sleep for.
Also starting lightdm manually (instead of using the init script) more often fails than succeeds. This confirms for me that it isn't just a script problem, rather, it looks as if it is somewhere in the Xorg binaries or a deeper script somewhere I suppose.