Cannot throttle to 0% using ATK3 joystick throttle control

[Aghanim]

KSP version: 0.90

OS: Lubuntu 14.04

I'm using 0.90 KSP with gamedata only containing squad folder, so it can count as unmodded install, as the problem also exists in the modded install too. jstest-gtk already confirms the joystick is working, and roll and pitch control is normal. The problem is that the throttle, which KSP recognizes as Logitech.Logitech Attack Axis 2, can only throttle from 50% to 100%. Putting the throttle lever in the joystick to lowest position and pressing X to kill throttle and set it to 0% and nudging the throttle lever a bit increases the throttle directly to 50%

System info:

Processor Information:

Vendor: GenuineIntel

CPU Family: 0x6

CPU Model: 0x3a

CPU Stepping: 0x9

CPU Type: 0x0

Speed: 3901 Mhz

8 logical processors

4 physical processors

HyperThreading: Supported

FCMOV: Supported

SSE2: Supported

SSE3: Supported

SSSE3: Supported

SSE4a: Unsupported

SSE41: Supported

SSE42: Supported

Network Information:

Network Speed:

Operating System Version:

Ubuntu 14.10 (64 bit)

Kernel Name: Linux

Kernel Version: 3.13.0-49-generic

X Server Vendor: The X.Org Foundation

X Server Release: 11501000

X Window Manager: Openbox

Steam Runtime Version: steam-runtime-release_2015-01-06

Video Card:

Driver: NVIDIA Corporation GeForce GTX 660 Ti/PCIe/SSE2

Driver Version: 4.4.0 NVIDIA 331.113

OpenGL Version: 4.4

Desktop Color Depth: 24 bits per pixel

Monitor Refresh Rate: 59 Hz

VendorID: 0x10de

DeviceID: 0x1183

Number of Monitors: 1

Number of Logical Video Cards: 1

Primary Display Resolution: 1366 x 768

Desktop Resolution: 1366 x 768

Primary Display Size: 20,51" x 11,54" (23,50" diag)

52,1cm x 29,3cm (59,7cm diag)

Primary Bus: PCI Express 16x

Primary VRAM: 2048 MB

Supported MSAA Modes: 2x 4x 8x 16x

Sound card:

Audio device: Realtek ALC892

Memory:

RAM: 13991 Mb

Miscellaneous:

UI Language: English

LANG: en_US.UTF-8

Microphone: Not set

Total Hard Disk Space Available: 103452 Mb

Largest Free Hard Disk Block: 58331 Mb

Installed software:

Recent Failure Reports:

Edited April 24, 2015 by Aghanim

[Claw]

This is a known problem with KSP/Unity interface. I personally don't know in which part the problem lies, but my understanding is that Unity processes raw inputs regardless of joystick calibration. So support for joystick throttles seems to be hit and miss.

Cheers,

~Claw

[Alshain]

Wait 3 days. Harvester re-tooled the Joystick input for 1.0. I can't promise that will fix your problem, but it might. We just have to wait and see.

[Aghanim]

This is a very sad thing but upgrading to 1.0 doesn't fix my problem. Maybe KSP expects input from 0 to 65534 but Linux give it -32767 to 32767

[sal_vager]

Have you tried starting KSP with the throttle centralized?