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Bug 1041

Summary: Bad axes recognition
Product: SDL Reporter: Mauricio Coto <mcoto800>
Component: joystickAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: critical    
Priority: P2 CC: danygradilla, markus.s
Version: 1.2.14   
Hardware: x86   
OS: Linux   

Description Mauricio Coto 2010-08-08 18:53:08 UTC 
Hello, 

I have a Ps3 Rock Band guitar, my system recognizes all buttons ok, but it recognizes only 1 axis. So when y call an event of other axis the software prints these error:

Segmentation fault (core dumped)

I put these print in a little program:


fprintf(stdout,"Axes: %1$d", SDL_JoystickNumAxes(joystick));

Result:

Axes: 1

When i try using jstest /dev/input/js0

It prints:

Joystick (Licensed by Sony Computer Entertainment America Harmonix Guitar for PlayStation®3) has 6 axes and 13 buttons. Driver version is 2.1.0.
Testing ... (interrupt to exit)

Any clue??
Comment 1 Markus S. 2010-08-18 03:27:00 UTC 
Same here but not with a PS3 guitar.

When I press on the d-pad of my game controller, any application that uses SDL
immediately crashes with a segfault.

Extreme TuxRacer prints:

%%% etracer warning: joystick y axis mapped to axis 1 but joystick only has 1 axes
Segmentation fault


# jstest /dev/input/js0
Driver version is 2.1.0.
Joystick (PS2700 Rumble Pad) has 7 axes (X, Y, Z, Rx, Rz, Hat0X, Hat0Y)
and 13 buttons (Trigger, ThumbBtn, ThumbBtn2, TopBtn, TopBtn2, PinkieBtn, BaseBtn, BaseBtn2, BaseBtn3, BaseBtn4, BaseBtn5, BaseBtn6, BtnDead).
Testing ... (interrupt to exit)
Axes:  0:-32767  1:-32767  2:-32767  3:-32767  4:-32767  5:     0  6:     0 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 11:off 12:off
Comment 2 Sheng Long Gradilla 2010-10-10 15:33:10 UTC 
This problem occurs with the Linux Input Event Interface or whatever it's called. If I chmod 0000 the corresponding /dev/input/event* files for my gamepads, SDL uses the old /dev/input/js* and works fine.

Might want to check the code for handling that part.
Comment 3 Sheng Long Gradilla 2010-11-20 16:46:02 UTC 
Ok, found the problem. 
The fix was commited long ago by Sam Latinga, but there hasn't been a new release of SDL 1.2, so those using the latest release (1.2.14) are having problems.

We need a new release!!

Here is the patch that fixed it:
http://hg.libsdl.org/SDL/rev/42012a6afb5b