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Bug 3538

Summary: Rumble not uploading correctly on Linux (Invalid argument)
Product: SDL Reporter: Angelo <spansjh>
Component: joystickAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.5   
Hardware: x86_64   
OS: Linux   

Description Angelo 2016-12-30 12:02:13 UTC 
The fix seems to be, instead of:

  linux_effect.id = effect->hweffect->effect.id;

We do:

  linux_effect.id = -1;

According to this page, -1 should be used as an ID for new effects: http://freegamedev.net/wiki/Force_Feedback

Without -1, I get an "Invalid argument" error in the ioctl call.
Comment 1 Angelo 2016-12-30 12:40:10 UTC 
This "fix" does however cause the gamepad to run out of available space for effects, so this is not a good fix.
Comment 2 Angelo 2016-12-30 13:55:39 UTC 
A little update on this, it seems to work if I try to run the rumble on my Xbox 360 gamepad via the Joystick interface, but not via the Gamepad interface. (eg. SDL_HapticOpen instead of SDL_HapticOpenFromJoystick)
Comment 3 Angelo 2016-12-30 15:46:21 UTC 
Consider this inavlid, it seems like initializing Fmod causes these effects to be invalidated. (Why, though? Fmod doesn't have any rumble abilities, does it? Odd..)