We already blacklist Lenovos because this breaks them - it seems that it breaks some Dells too (http://lists.us.dell.com/pipermail/linux-desktops/2012-April/003976.html). The boot flag workaround doesn't seem to be sufficient. Since we're unlikely to ever be sure that we've found the full set of broken machines, it's safer to revert back to using MBR on BIOS systems.
We should also add an inst.gpt option to force using GPT for those that want it.
Discussed at 2012-05-03 blocker review meeting. We agreed this does not constitute a blocker, though it's a sensible change and will make the release: there's no clear evidence it breaks enough systems to constitute criteria breakage, and indeed if it were truly a blocker, we should be recalling Fedora 16... -- Fedora Bugzappers volunteer triage team https://fedoraproject.org/wiki/BugZappers