Emulator

I can confirm the same issue happens on the most recent build.

That's strange, I'm not getting this problem. I can boot into SSBM no problem, whether I boot it by holding "A" and telling the IPL to boot the disk, or if I just let the cube roll around then it starts the game itself.

I can even confirm issue 3583 still exists.

I do admit it's probably something I've done, but I think the real issue here is that it's not clear on how to properly install the IPL as the above inferred.

all you need to know is the region of the gamecube that you dumped your ipl from
folder is Sys/GC/

I did that, and it did not work.

Make sure it's named "ipl.bin"

Mine's in sys/gc/USA I believe.

That's not what I meant. "The disc cannot be read" still appears. The IPL loads fine. But it cannot proceed into the game.

what region of gamecube did you dump the ipl from, what region is the game that you are trying to load

The IPL that I possess is USA, and the game that I have is also USA.

what is the md5 of your ipl?

Works fine here with USA/USA. Check the IPL file hash, you probably have a bad dump.

The one I have has a CRC32 of 6D740AE7 and works perfectly (disregarding issue 3583, which I don't think is a problem with my IPL.bin).

The newer one with the same CRC32 6d740ae7 signature has the HLE buzz. I think there's just poor IPL version support if the other IPL gave me clear HLE audio, but this one gives the ear bleeding buzz I complained about earlier, even though it didn't matter that much. The issue's past closed unless you consider the poor IPL version support I just complained about. This issue can die now..

Dolphin should probably check the hash of the IPL, if it doesn't do that already. Other than that, yeah, invalid issue as LM1234 says.