Comment 16 for bug 851612

Chris Halse Rogers had a look into this and he came to the conclusion that adding a VT_WAITACTIVE after the VT_ACTIVATE ioctl may help the situation. It looks like there is a race condition somewhere between LightDM, the kernel, ConsoleKit and X and adding the VT_WAITACTIVE either solves this (or hides it). Sebastian Bacher tried this patch and it seemed to improve the situation for him, I've been running with that patch today and it seems good too. So I've made that change to master.