Bug #4294: Mouse drag event causes framerate to drop significantly on Linux - Kerbal Space Program - Squad Bugtracker

Bug #4294

Mouse drag event causes framerate to drop significantly on Linux

Added by kshade about 9 years ago. Updated almost 5 years ago.

Status:

Closed

Severity:

Low

Assignee:

Category:

Controls and UI

Target version:

Start date:

03/19/2015

% Done:

100%

Version:

0.90

Platform:

Linux

Expansion:

Language:

English (US)

Mod Related:

Votes:

Description

When I click-drag the mouse, for example to rotate the camera, my framerate is reduced to very low single digits. This happens during flight in first and third person view, on space center screen and in the tracking building, not in the two assembly buildings though as far as I've noticed. Rotating the camera with the cursor keys is nice and smooth but even then holding a mouse button and dragging will cause lots of stuttering, even if it's a button that shouldn't do anything (middle click & drag on the solar system map for example). I've tried this with mods installed and vanilla with roughly the same results.

Here's some people with the same issue (setting my locale to C didn't help, neither did pressing F2):

http://forum.kerbalspaceprogram.com/threads/101374-number-of-issues-running-KSP-on-Linux-Ubuntu
http://forum.kerbalspaceprogram.com/threads/94378-Linux-Camera-Rotation-Stutter

System information from Steam:

Processor Information:
Vendor: GenuineIntel
CPU Family: 0x6
CPU Model: 0x3a
CPU Stepping: 0x9
CPU Type: 0x0
Speed: 3800 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported

Network Information:
Network Speed:

Operating System Version:
"Funtoo Linux - baselayout 2.2.0" (64 bit)
Kernel Name: Linux
Kernel Version: 3.18.7-gentoo
X Server Vendor: The X.Org Foundation
X Server Release: 11601000
X Window Manager: Xfwm4
Steam Runtime Version: steam-runtime-release_2015-01-06

Video Card:
Driver: NVIDIA Corporation GeForce GTX 660/PCIe/SSE2

Driver Version:  4.5.0 NVIDIA 346.47
    OpenGL Version: 4.5
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0x11c0
    Number of Monitors:  1
    Number of Video Cards Not Detected
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 1920 x 1080
    Primary Display Size: 20.08" x 11.30"  (23.03" diag)
                                            51.0cm x 28.7cm  (58.5cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 2048 MB
    Supported MSAA Modes:  2x 4x 8x 16x

Sound card:
Audio device: VIA VT1708S

Memory:
RAM: 15504 Mb

Miscellaneous:
UI Language: English
LANG: en_US.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 1345476 Mb
Largest Free Hard Disk Block: 750970 Mb

hardinfo_report.html (55.9 KB) hardinfo_report.html	Detailed system information	D_U, 04/30/2015 03:20 PM
Player.log (205 Bytes) Player.log	KSP player.log (.config/unity3d/Squad/Kerbal Space Program)	D_U, 04/30/2015 03:20 PM

History

#1 Updated by kshade about 9 years ago

This still happens in 1.0, most notably in IVA.

#2 Updated by D_U about 9 years ago

File hardinfo_report.html hardinfo_report.html added
File Player.log Player.log added

I can confirm the same issue on an Ubuntu 15.04 system.

Whenever I use the right or middle mouse button to drag the camera, the framerates drops significantly (from about 80 fps to under 5 as long as I move the camera) no matter how fast the camera is moved. Using the arrow keys results in a smooth camera movement.

The same stutter occurs when I'm dragging an UI-element (e.g. a Mod-button).

KSP is unmodded, Steam-startoptions doesn't do anything to the issue (LC_All=C command_64). The issue occurs as well when I'm starting KSP without Steam.
Changing graphical settings (AA, VSync, SM3 Terrain Shaders, Terrain Scatters, Render Quality, ... ) doesn't help either. It occurs with the 32 bit as well as with the 64 bit Version.

The logs and debug-log doesn't show anything at the time the issue occurs (player.log is attached).

Game version:

KSP 1.0.0, Linux 64bit (as well as 32bit)

build id = 00830
2015-04-26_12-45-35
Branch: master

System information:

CPU: Intel(R) Core(TM) i7-3720QM CPU @ 2.60GHz
GPU: NVIDIA Corporation GK104M [GeForce GTX 680M] (changing driver doesn't change the issue)
OS: Ubuntu GNOME 15.04, AMD64, Kernel: 3.19.0-15-generic

Detailed system information and the player.log are attached.

#3 Updated by D_U about 9 years ago

Workaround/Fix found:

Setting the mouse polling rate from (in my case) 1000Hz (Logitech G700s gaming mouse) to 125 Hz fixed the stutter for me.

How I found out: I used the touchpad (playing on a laptop) to reproduce the issue, but that didn't result in any stutter or framerate drop, so I tried to find the difference between the external mouse and the touchpad: the latter hat a polling rate of 80Hz.