Emulator

You should use the forums... but...
did you test with DX9, OGL?
have you tried other games?
your wiimote works perfectly on a real wii?

I've heard that it can become out of sync even on a real wii. You need to compare Dolphin to the real Wii and see how often you have to sync up.

I'm sorry, I did look all over the forums for an answer to my problem. I also extensively searched too. All I could find was someone having a similar problem with a sword game in Wii Sports+.

I did test with DX9 and OpenGL, still same issue. I also tried software renderer, same issue. Yes the wiimote works fine with an actual Wii. That was my first thought that it was a problem with the wiimote. As far as problems with the real wii, I can play for an hour or more and not have this issue. For the sake of trouble shooting, I also exported my save file from Dolphin and played it on my actual Wii.

My background is SQL, not programming; though what could be happening is that the emulator is not processing all the information. I noticed if you sword fight really "slow" ie don't waggle the wiimote that much, it tends to do OK for longer rather if you shake it around. Could it be the emulators interpretation of the data?

Press down in the d-pad while pointing to the center of the screen in any moment in order to recalibrate it. That happens with the real game often and you don't need to enter the menu to fix it.

Oh and you need the sensor bar in order for the wiimote to be properly calibrated.

OK I have a wireless sensor bar for my PC setup, yes I calibrate with it when I start the game. I'm aware that pressing down on the d-pad re-centers the device, but it does not calibrate the wiimote. The problem is that if the sensors think the wiimote is pointing left when in reality you are pointing it forward, pressing down on the d-pad to re-center it won't do anything you will still have to move the wiimote to whatever position it thinks forward is. When you start the game it actually calibrates the wiimote, then you use the IR Bar to center it. I'm not experiencing this problem with the actual Wii system. Yes you do have problems with the real Wii with the wiimote becoming un-centered, and have to re-center it with the d-pad, but this is not that.

I can confirm that a real wiimote looses calibration very quickly, at least once every 5 minutes.

What dolphin revisions have you tried, geminix? I played through the game on 3.0-600 without difficulty.

I have tried 3.0-862 and 3.0-458

I have had something similar happen to me as well, but it didn't really affect me for most of the game. It's most noticeable with small motions, like targeting the clawshot, where the cursor will drift slowly while you try to target something. I was still able to swing the sword in the direction I wanted most of the time, but I had to make sure to exaggerate the motion. It also makes the harp minigame much more difficult. I would usually restart the emulator once every few hours to reset the calibration. After getting a new bluetooth adapter, I did notice that the motion-plus movement was much more accurate (though still not perfect), so maybe it has something to do with that.

I can confirm this bug. It seems to do this to a tiny extent on the real Wii over a 30-60min period, but 1 or 2 sword slashes is enough to throw off Dolphin.

I've just chalked it up to the crappy WM+ emulation, since this happens in Wii Sports Resort swordplay too.

Never say never, it is just a matter of time and effort put into this. And I wouldn't say it works extremely well. SS is playable but exact swordplay is nearly impossible at the moment, since it gets out of sync way too quickly.

Happens to me as well, it really takes away from the experience.

just aim the wiimote at the sensor bar once in awhile and it learns it's neutral position again, i haven't had much trouble.

Actually this is pretty noticeable when chopping bamboo. it becomes so miss-aligned that horizontal sword swings become vertical swings making it VERY difficult to score anything reasonably high. (and I was swinging while aiming at the sensor bar)

I can also confirm this issue. It seems that pointing the Wiimote at my sensorbar every now and then while aiming something or while in a menu seems to fix it (I don't usually have to tell it to recenter either, unless I need the cursor).

Still not sure if this is a bug with the game, dolphin, our individual bluetooth stacks and/or adapters, or some awkward combination of all three. It's not a game-breaking bug, but if it's still possible to improve it, that would be nice.

For me pointing the Wiimote at my sensorbar does not fix it. It is only fixed by manually telling it to recenter and this works for 1-2 minutes or so, then I have to recenter again. Other games work fine.

Having played this game on console, i think you should consider yourself lucky if you only have to recenter the cursor every 1-2 minutes.