Game has explainable lag issues - No one knows whats wrong

[Dillett7799]

Alright, long story short, the game lags with mouse input. My PC is awesome, and I've done a clean install with no mods. Started 3 months back, miss playing KSP. Heres a video

Long version. Here's where I've been. I've tried both 32/64 versions, same issue. Clean install, same problem. I've tried working with the natural settings log with the fix found here http://www.reddit.com/r/KerbalSpaceProgram/comments/1tb006/023_ksp_performance_fps_tweak_guide_all/

I have 32gig of ram and a GTX670 graphics card, my system DID run the game flawlessly with tuns of mods installed and graphics boosted to all heck, now I can't even play around in the VAB (see video).

I've cleaned up my PC, ran virus checks, defragg'ed the disk (I'm now booting KSP off a SSD and its the ONLY thing on that SSD) and nothings fixing it. I'm out of ideas, anyone here have any?

[Padishar]

Well, I think I'd start by investigating things concerned with input devices. What mouse do you have? Have you updated the drivers for it recently? Have you tried a different mouse? It may be that there are multiple drivers trying to get involved. Have you installed any other USB devices recently (joystick, webcam, memory cards, phones etc)? Check for any devices showing a warning triangle in device manager and uninstall them, then scan for hardware changes to reinstall them. Perhaps try uninstalling all your mouse drivers. Does the same thing happen with any other software (e.g. other games, playing video etc)?

[Dillett7799]

Well, I think I'd start by investigating things concerned with input devices. What mouse do you have? Have you updated the drivers for it recently? Have you tried a different mouse? It may be that there are multiple drivers trying to get involved. Have you installed any other USB devices recently (joystick, webcam, memory cards, phones etc)? Check for any devices showing a warning triangle in device manager and uninstall them, then scan for hardware changes to reinstall them. Perhaps try uninstalling all your mouse drivers. Does the same thing happen with any other software (e.g. other games, playing video etc)?

I've tried 3 different mouses, uninstalling all drivers. I've uninstalled drivers for all USB devices I have plugged in, including mouse and keyboard, then just plugged in my mouse and downloaded that driver. No fix. Went though device manager and fixed all the errors including updating drivers, no fix. No other software causes issues. Thanks for the input thus far as well, I appreciate it.

[steve_v]

Ya know, that looks just like an IRQ conflict from the bad old days.

It's a long shot, but have you tried messing with APIC / IRQ settings in BIOS?

[Dillett7799]

Ya know, that looks just like an IRQ conflict from the bad old days.

It's a long shot, but have you tried messing with APIC / IRQ settings in BIOS?

How would one go about doing that?

[steve_v]

Boot into BIOS setup, have a look around until you find somewhere where you can change those settings? Dunno, it varies per motherboard, read the manual?

You'd be looking for an IRQ line that's marked as 'shared' probably by both the USB chip and something else, eg. GPU. get the USB chip off of it.

IIRC there's a way to do it in windows too, but I don't use windows.

Make a note of what you change, IIRC disabling APIC (Advanced Programmable Interrupt Controller) can make Windoze not boot...

[vexx32]

Are you... referring to what I've only ever seen in Windows as resource conflicts?

You can do that from Device Manager. Go to Start, right-click My Computer (or Computer, if you're on Win7/8) and select Manage. A nice complicated Management screen will pop up with two panes. In the left pane, look for the entry named Device Manager. Click it, and you'll see a list of all your computer's devices appear in the right pane. What you'd want to do is work out which USB hub your mouse is on. That's a little above my knowledge as I've never needed to do it myself, but from memory you can open the Properties of the mouse (which you will almost certainly find under the name Human Interface Devices, or sometimes Input Devices) and look through it. In the information there it should list which USB hub it's attached to. If not, you'll have to compare them all.

A little further down the device list, you're looking for USB Root Hub devices. Depending on how many USB ports your computer has, you may have several. My own computer has three sets of USB ports, and the device listing has something like four to six USB Root Hub devices. Open the Properties windows of each of these, and look through their Resources tabs. If any of them list a Resource Conflict, change their assignment right away. Otherwise, you might have to note down the resources they're using, and compare them with other devices -- as steve_v said, might be an idea to check the video card, which you'll find under the Display Adapters category.

EDIT: I also found this, which seems to be a slightly simpler way of doing it, but essentially the same. Perhaps the pictures will make the steps more clear, if need be.

http://www.helpwithpcs.com/upgrading/change-irq-settings.htm

Edited November 8, 2014 by vexx32

[steve_v]

Are you... referring to what I've only ever seen in Windows as resource conflicts?

Yup, that's it