Quote: I was just curious, because during the Supergirl arc in the old Jeph Loeb Superman/Batman series , Darkseid shows up at the Kent's house to attack Superman. So, I gather that this means that he knew that Clark was Superman. At the very least, he knows where he lives. Did he ever attack him at his house again after that? To my knowledge he has not, but if he does know who he really is or where he lives, do the math.
Way back during Bryne's run, Darksied summons Superman and nabs Clark Kent instead. Later in the same issue, Darkseid comments that Superman's human disguise did not work on him and knew immediately who he was. So, yes...Darksied does know Clark Kent is Superman. And as far as I know, has never visited the Kent farm outside of the instance you mentioned.
Quote:Was his knowing his identity ever brought up again
Not to my knowledge.
As for who else knows, well, Lana Lang knows, Strange Visitor knew before she died...
Liked the time when Ckark played reporter to interview darkseid, and the Phantom Stranger showed up...