There's a way to adjust mouse sensitivity for the free look, while moving, etc. but not when in the interface. For me the mouse is very slow in the interface, requiring me to drag it across the mouse pad a few times to go across the screen. Very frustrating when dealing with dialogs, menus, etc. I checked User.ini but none of the mouse settings in there seem to help. Is there any way I can fix the sluggish mouse in the UI?

Open the launcher and go configure settings. Put it down at 1024x768 (or try bigger, whatever works best for you, play with it a bit)

At 1280x1024, the game is unplayable.
At 1024x768, I can sortof read stuff, and the game runs smooth, go figure.

Same problem here. Config: Windows 7 64, ATI 4870, catalyst 11.4, all catalyst 3d settings disabled. Playing at 1920 x 1080.
Different resolutions, or changing mouse sensitivity via in game option, do not change this behavior.

I'm going to try to set mouse smoothness in ini file, as suggested elsewhere, although this does not seem to work in each setup.

file: Documents\Witcher 2\Config\User.ini
find [MouseInput] section and set
MouseSmoothness=0
Smoothness=0

Note that I am not sure about location of ini file, this is a suggestion I found on the web and I cannot check now. In case you cannot locate it just search for user.ini file on your installation drive.


I'll post my result, if this is helpful to others having this problem please report.

Regards

Faz

I've got this problem as well.

Try to turn off vsync.

I'll give that a try when I get home, but then there's usually tearing in the screen. I'd rather keep that on. I'd also rather keep it at 1600x1200 native resolution of the monitor so lowering the resolution isn't an acceptable solution either. The game is running fine for me at 1600x1200, FPS seems to be solid over 30, so it's not a slow-down issue. It's just an issue of the mouse sensitivity not being adjustable, and not scaling well to higher resolutions.

I did shut off the smoothness figures and that helped a little bit. movement is still slow, but it is at least not being smoothed out. I'm also using the keyboard for dialog which helps, but there's still other times the mouse must be used.

Even if you disable vsync in the game, you can still force it via drivers (along with triple buffering, if needed) to prevent screen tearing. This method helps with mouse lag in some games, so it's worth giving it a shot.

>>>>> DISABLE V-SYNC <<<<<<<<<<<<<<<<

WILL SOLVE ALL YOUR PROBLEMS.

It doesn't solve the problem because there's still mouse acceleration even with those things set to 0

Vsync in its very nature adds mouse lag.

Disable it, or live with the tearing, or enable vsync through drivers.

I prefer some tearing over mouse lag. To each his own!

I prefer neither. It's not mouse lag though, it's mouse acceleration.

you mean software mouse

Say what you mean, mean what you say.

But I digress, it's all the same thing in the end. It's the effect.

not its not. acceleration causes your mouse to speed up the faster you move it.
this will never cause slowdowns.

in a game that has a software mouse acceleration is only a property of a software/ hardware mouse. if the game sued a hardware mouse acceleration could still be on it and you will not feel a slowdown.

the slowdown is due to a lower FPS, a lower fps means a software mouse needs to fallow the FPS that the game has, if it was hardware it would not slowdown depending on frames.

That's inaccurate, if the FPS is low the mouse movements should just appear jumpy, not actually move slow. It's simple enough for the game to track how much the physical mouse has moved in between frames. If the FPS did affect it the that is a horrible bug where something is capping the movement per frame.

I however don't have FPS issues or lag issues, I am having sensitivity issues. Moving the mouse 1" physically equates to too small of a movement on screen. The amount it moves on screen with the smoothness shut off perfectly reflects how much I move it physically, regardless of the speed at which I move the mouse. The problem is you can't adjust what the amount it moves on the screen is and with my mouse that amount is far too small.

I imagine I could buy a mouse with a higher sensitivity or one of the ones that lets you adjust the mouses sensitivity and solve my problem that way, but it's simple enough to code in a UI sensitivity problem and just solve this in the game like many other games have.