Saw this advice at Gamefront, but wasn't sure if subsequent official Bethesda patches have improved the problem such that these tweaks are unecessary:

Disabling mouse smoothing/acceleration
Mouse acceleration can be more frustrating than helpful, and there’s no in-game option to disable it.

• Go to your Steam Directory -> steamapps -> common -> skyrim -> Skyrim
  
• Create a backup of the SkyrimPrefs.ini file
  
• Open the file, then scroll down to where it says [Controls] and find bMouseAcceleration=1
  
• Change to bMouseAcceleration=0
  
• Save, exit, and play

Fixing the vsync “laggy mouse” problem
If the mouse acceleration fix didn’t solve all your sluggish mouse issues, try this one. Also be sure to disable all gamepad support.

• Go to your Steam Directory -> steamapps -> common -> skyrim -> Skyrim
  
• Create a backup of the SkyrimPrefs.ini file
  
• Open the file, then scroll down to where it says [Display]
  
• Add to the bottom of the section iPresentInterval=0
  
• Save, exit, and play

Thanks

Disabling the mouse accleration is highly recommended. Only disable V sync if your mouse is slugglish and (if you do disable it) use a FPS limiter to prevent bugs.

Yep and using V-Sync stops bugs.

ROFL

I disabled v-sync the first day and hadn't experienced any of the bugs some people claim V-sinc avoids, while there are folks with V-sinc active having that problems. Not sure if it could have some influence, but I can assure you suppossing it has is not a direct one.

Irrespective of the supposed time drifting bugs that may or may not be linked to vsync (personally I don't think they are), there are definitely physics bugs exposed when you disable vsync.
Their rigid body physics engine does not stablize correctly if the simulation timestep falls much below 16ms. (>62fps)

Even though I haven't disabled vsync within the game, I think I have encountered the bugs you are describing, right at the beginning of a new game.

Right at the beginning, when being led in the horsedrawn carriage to my execution, weird things were happening: arriving at helgen and having to wait a long time for guards to open front gate; first carriage tipping over on its side, getting stuck, and then warping through a building to arrive at the execution site; getting stuck b/c my horse tips over on its side and doesn't get back up, so we stop moving.



Do you think these bugs are related to the fact that my FPS is 150+? I installed RadeonPro and created a profile for Skyrim (well, for the SKSE launcher that I run the game from within Nexus Mod Manager). I followed the advice of Ghost23 here:

http://www.overclock.net/t/1164844/skyrim-crossfire-issues-complete-list-of-known-fixs-here-12-1a-and-11-12-cap2-links-inside
"Radeon Pro fix : Download Radeon pro from the following link ; http://www.radeonpro.info/en-US/ Once you've downloaded Radeon pro, create a new profile. Locate the Skyrim.exe and select it, after that, maneuver your way to the Tweaks tab and force the Bishock Anti-aliasing profile. This should increase your crossfire performance ten fold."

If so, is it maybe a matter of disabling whatever aspect of my RadeoPro profile that's pushing FPS beyond 60?

It's not turning vsync off that's causing timing issues, it's using a framerate limiter. The catch is, if you want to turn V-sync off you basically have to use a limiter to prevent physics bugs, which ofcourse then introduces timing bugs. God help the people with 120Hz monitors and want to run the game natively, because they'll get physics bugs too. The way the engine is written baffles the mind.

OK, so then I should keep V-sync on, which I currently am doing- and then....disable or enable a framerate limiter? Sorry, just a bit confused here. Might have to poke around the RadeonPro profile settings to see.

I am fine limiting the FPS to 60....no need to have anything above that, imo.

You shouldn't use a framerate limiter at all.

Lemme step back a minute here: Now that the newest AMD Catalyst and CAP drivers are out, should I be using a 3rd party app like RadeonPro to manage my Skyrim profile? The reason I did so was b/c of how much it allegedly (and it does, based on my experience) improves Crossfire performance. But the fewer apps I need to run to obtain great performance, the better.

I'm running two 6970s in Crossfire, btw.

Disabling VSync was never "recommended," as it causes other problems due to havok physics and timing. Turn off mouse acceleration to improve mouse control.

It was, in that that step was suggested in numerous locations (some from trustworthy sources) online. That doesn't mean it was a good idea, of course.

5 a day was recomended, now we're told it can be bad for your teeth (too much acid) lol. Times change.

Any rig with a decent video card will go bonkers in a high FR area with VSync turned off....I would not suggest that.

even with vsync enabled and working sometimes when stepping up to the enchanter or alchemy table or walking through a door into a small building can send random objects flying in bizarre directions...

without v-sync..... I've walked into a weapon riddled building and gotten slaughtered/killed by the number of objects crazily flying around at speeds that are worse than getting nailed by a sharp shooter.

Have you got a 120hz monitor?

I have a related question about VSync. I don't mean to hijack so if this is the wrong thread to ask I could go start my own instead.

But the problem is that I can't get VSync to turn on. I'm trying to get it turned on because I'm experiencing the physics bugs. I set iPresentInterval=1 to SkyrimPrefs.ini in Steam\steamapps\common\skyrim\Skyrim and Documents\My Games\Skyrim but despite that my framerate still shoots up to 120. I'm an AMD user currently using Catalyst 12.1 preview. I tried forcing VSync on in the Catalyst Control center but even with that my framerate goes to 120.

Anything else I can do to get VSync working?


Edited to add: I think I found the problem. It's due to Crossfire. Using an application profile to turn off Crossfire for Skyrim only didn't work, but globally disabling the entire feature allowed VSync to work again. This is not an ideal solution for me because I want to have crossfire enabled, so if anyone has other ideas on how to make this work, I'd love to hear them.

no the ve278q 27" monitors are not 120hz...

Don't set it in the skyrimprefs.ini.. set it in the skyrim.ini file intstead.. make sure it is 1 and NOT 0. the one in skyrimprefs.ini is pretty much useless... has no effect... looks like leftover garbage

Now how does input lag come into play here? The game runs extremely fine, constant high fps. However in some cases (mostly in dungeons), I'm getting HORRIBLE mouse lag altough the fps seems to be high (haven't monitored it using tools yet).

I still have vsync off (ini and driver). What would you guys suggest here? Generally enable vsync in ini and set driver to something like "Off, unless application specifies" or "Always on!"?

Many thanks in advance!

Catalyst question for those with AMD cards- how do you enable vsync from with the Catalyst settings? I don't see an option for it.Thanks.

Gaming->3d application settings->wait for vertical refresh

Agreed. One of the known bugs with Vsync turned off is when you step inside your house or shop and all the items on shelves go flying, Once I turned vsync back on this physics bug disappeared

I appreciate the suggestion but skyrim.ini seems to have a different purpose than skyrimprefs.ini. I nonetheless tried adding the VSync enabler line just to see what would happen. I didn't work, but thanks for trying to help.