Comment 3 for bug 8177

When we do a DDC probe to extract the list of supported resolutions, we have to
communicate with the card directly to query the monitor. That's always going to
hurt. On PowerPC, we are mercifully provided with a file called 'EDID' or some
variation thereof; on i386, we drop into real mode and make a VESA BIOS call (to
the video BIOS). It's just that I haven't been through the code available to do
it on amd64 and see how it happens.