Emulator

Sorry I didn't get to this sooner. Does this game support Wiimotes and GC controllers? It's possible that Mario Kart Wii works because it supports both, and you have one GC controllers and One Wiimote plugged in, making it so two controllers work. Maybe try configuring or making sure a second Wiimote/GC controller are plugged in.

There's a chance that this is a bug as well, but, I'd like to make sure it's not something silly.

Yes, i know that Mario Kart Wii works with both GC and Wiimote controllers. But i have tried with GC controllers disabled since Sonic & Sega All-Stars racing only supports Wiimotes.

did you make sure to set two wiimotes plugged in, and configure both of them, and make sure they both had nunchucks plugged in if necessary?

Both have nunchucks plugged in, and are configured. I set two wiimotes, and disabled GameCube controllers. I just tried again. It is the only Wii game i have that doesn't work in 2P-mode on my two computers.

Then I wonder what's going on... This game is fairly popular, maybe someone else can swing in and confirm.

How can i help you to confirm it is a real defect?

Hi can confirm What Paul Fox has reported above

Exact same issue and have checked I have set up correctly.

Using i5 4460 win 7 home premium sp1. Dolphin 4.0-1869

Okay, hitting ALT+F6 allows player 2 to choose a player! I have made a small video : http://youtu.be/UaBJ4KD8T0U
BTW, why does this "trick" is necessary only for this game in particular?

Hi

Sorry to contradict Paul F but that didn't work for me. I've got messages on and it showed up "Wiimote 2 connected" on pressing of ALT -F6, but then nothing and wouldn't recognise input. Double checked to see if I hadn't cocked up the settings for wiimote 2 on the config screen but it all looks fine. Other 2 player games work fine too eg GTI Festa etc

I wonder if it's because I'm using emulated wiimote rather than real? Not sure why that would make a difference though. game runs fine otherwise in 1P btw. Like Paul said not had this problem with other 2 player games

So can we consider this issue as a defect?

No, because some games will disconnect Wiimotes at points; more research is needed.

I agree. I'd like to hear from other users too. Other people must have tested this game and I wonder how they get on

Please send AA batteries :|

You can use emulated wiimotes to test this!

Issue 6239 has been merged into this issue.

Issue 7761 has been merged into this issue.

I think that this has to be related to the issue with Metroid Prime: Trilogy having disconnect problems. I even have a DolphinBar, which previously worked, but now it doesn't whether or not Speaker Data is off or on. BillyAlt has a complete description of the problem in recent versions of Dolphin in the wiki:
https://wiki.dolphin-emu.org/index.php?title=Metroid_Prime:_Trilogy

Just an FYI, this bug makes Metroid Prime Trilogy 100% unplayable, because the wiimote desyncs, and a message essentially states that the wiimote is disconnected. Nothing can get it to be playable, at least not anymore.

I just hit Alt F5 after the initial disconnection and it's fine. Anything else is unique to your situation.

This still needs to be handled. Is there anyone willing to look into this?

Issue 8213 has been merged into this issue.

Wow, well done! Thanks!