[MC-48219] Keyboard input causes mouse look to stutter or jerk (Fixed in LWJGL 2.9.3)

Mouse look movement stutters or jerks irregularly when holding keys down. This effect becomes much more pronounced at low frame rates.

The first example is with the frame rate locked at 10 and shows how the mouse look input is uneven and jerky when holding down shift to crouch:

https://www.youtube.com/watch?v=3f7FDMI2yQE

Here is an example with just moving the mouse in a small circle with the frame rate locked at 30 fps:

http://youtu.be/985aI-JfXUE

While a key is held down the sensitivity drops in a repeated cycle, causing the view point to spiral inwards when moving the mouse in a circle.

The issue turns out to have been in LWJGL, and has been fixed in 2.9.3. If Minecraft updates to use LWJGL 2.9.3 instead of 2.9.1 the problem will be resolved.

Linked issues

relates to 1

MC-43093 Mouse sensitivity affected when limiting FPS or activating VSync Resolved

Attachments

crash-2014-02-11_01.59.04-client.txt

Comments 20

kumasasa 2014-02-11T07:02:06Z

Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.

Jon P. Inghram 2014-02-11T08:29:42Z

This effect is still present, but almost imperceptible on my laptop running Windows 8.1 64 bit with an Intel Core i5-3230M and integrated HD 4000 graphics.

I found a couple forum posts of other people with the same issue, apparently it's been around for a little while:

http://www.minecraftforum.net/topic/1302194-intermittent-mouse-sensitivity-loss-ingame/
http://www.minecraftforum.net/topic/1872298-mouse-movement-diagonal-player-movement/

And I just found another bug report that might be related: https://bugs.mojang.com/browse/MC-43093

kumasasa 2014-02-11T19:10:54Z

Did you install the latest NVIDIA driver http://www.geforce.com/drivers/results/71704 ?

Jon P. Inghram 2014-02-11T19:34:09Z

Yes, when I first noticed it happening I was using the 332.21 drivers. I have since updated to the beta 334.67 drivers, http://www.geforce.com/drivers/results/72576 , with no change. I have tried booting with no other USB devices besides the mouse. I have tried connecting the keyboard (a Microsoft Natural Keyboard Elite) with both via PS/2 and USB without any effect. It happens with both Logitech G500 and a Microsoft Wheel Mouse Optical mice. This will also happen if I bind a mouse button to perform a keypress instead of a regular mouse button press.

Pressing multiple keys simultaneously effects the issue. If you start by, for example, holding shift, and then press and release the "G" key, the mouse look movement returns to normal even though you're still holding shift to crouch (and you do remain crouching.)

Jon P. Inghram 2014-02-11T19:56:34Z

Just discovered something: It's directly influenced by the Windows keyboard repeat rate setting. If I set that to the minimum the effect is much less obvious, and when at max it becomes even more visible.

10 more comments

Fluffy89502 2014-02-11T23:30:42Z

Influenced by lag. Happens on my laptop.

Jon P. Inghram 2014-02-23T17:55:44Z

I've since updated my video drivers to 334.89 and also tried the Java 1.8 early access release without any changes. I suspect the issue is in the way Minecraft and/or LWJGL handles repeating key input from keys being held down.

Jon P. Inghram 2014-04-14T16:48:52Z

Here's a better video of this problem: http://youtu.be/985aI-JfXUE

The frame rate is locked to 30 fps, and I just move the mouse in small circles. The mouse look sensitivity smoothly drops and then jumps back up in a repeating cycle as long as any key is held down. As soon as the key is released the movement returns to normal.

Jon P. Inghram 2014-05-25T23:31:00Z

I just checked and this does not happen when running Minecraft in Linux (Ubuntu 14.04) on the same system.

Jon P. Inghram 2014-10-15T20:32:38Z

I found a report of a similar problem in SDL ( https://forums.libsdl.org/viewtopic.php?t=3463&sid=964c840d9a6461f79e00ccd745da6c1c ) which used/uses the same WM_MOUSEMOVE messages from Windows to track mouse movement as LWJGL.

Luciano Alvarez Candal 2014-11-08T18:20:12Z

Same thing happens to me. Only in windows 7 , I installed a fresh copy of w8 and w7 and only w7 is affected . Also the tipe of mouse is important , the gaming mouses with specific drivers make it looks even more shutter. please mojang fix this I don´t want to go back to w8 , directx 11.2 is so bad for old games

Jan Leeuwenburgh 2014-12-06T20:54:09Z

Confirmed happening on 1.8.1 WITH 60 fps and highest possible graphic settings

Ioannis Tsakpinis 2015-01-14T19:57:06Z

I have identified a problem in LWJGL that may be causing this issue and have pushed a fix. LWJGL 2 nightly builds are currently down, but I have uploaded a build here (lwjgl.jar only). Could someone try it out and let me know if it fixes the stuttering problem in Minecraft?

LWJGL 2.9.2 was released a couple of weeks ago, but I'll do a 2.9.3 release just for this.

Jon P. Inghram 2015-01-15T18:57:04Z

Unfortunately Minecraft doesn't run correctly if I try that .jar. It starts in a tall, narrow window that is always pushed most of the way below the screen: http://i.imgur.com/sIpQVgQ.jpg . If you enlarge the window it's mostly blank with the normal animated background in one corner, and no UI or any other way to interact. They're still using LWJGL 2.9.1 in minecraft, perhaps it'll work correctly if they update the included version.

Jon P. Inghram 2015-01-15T19:17:06Z

Ah, that DID fix it! 😃

I had to download 2.9.2 and insert that version first to get the one you linked to work correctly, and now the mouse works perfectly, thanks! Hopefully Mojang will update to 2.9.3 when it's released then. Again, many thanks!

James Smithers 2015-01-16T02:55:21Z

Jon P. Inghram - would you please be able to give me instructions on how to do this? Because when I tried to do it it didn't work. I launched Minecraft and it said Ready to Download and Update so it just replaced my changes. Not sure if I got the wrong file or replaced it wrong so links to correct files and instructions would be greatly appreciated. (btw this is on version 1.8.1)

Jon P. Inghram 2015-01-16T06:28:31Z

I took the relevant files from the LWJGL 2.9.3 nightly build from today and stuck 'em in a zip file with the correct directories and .sha files so the launcher doesn't automatically download the old 2.9.1 files:

https://drive.google.com/file/d/0BzS6i2JCDwdtVEYxd0FxR2lIbkU/view?usp=sharing

Extract the folders in the archive into the \.minecraft\libraries\org\lwjgl\lwjgl folder and it'll overwrite the LWJGL 2.9.1 files.

If you want to do it yourself, you can download the 2.9.3 nightly build yourself http://legacy.lwjgl.org/download.php , replace Minecraft's LWJGL 2.9.1 files and make new .sha files to match the new versions so they don't get overwritten by the launcher.

Ioannis Tsakpinis 2015-01-19T00:27:23Z

LWJGL 2.9.3 has officially been released and includes the fix for this issue. Details here.

Erik Broes 2015-01-20T06:30:46Z

Now for it to appear on maven 🙂

Erik Broes 2015-01-22T11:13:10Z

I asked for the needed data and the next pre-release will test 2.9.3 now!