722665 - Accelerometer data has it sign reversed for MacBook Pro 8,2

Status: UNCONFIRMED

(Core :: Widget: Cocoa, defect)

Description

[Xavier Rubio Jansana]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

Steps to reproduce:

See the following code:

window.addEventListener('devicemotion', function(eventData) {
	var acceleration = eventData.accelerationIncludingGravity;
	var facingUp = -1;
	if (acceleration.z > 0)
		facingUp = +1;
	var tiltLR = ((acceleration.x) * 90);
	var tiltFB = ((acceleration.y) * 90 * facingUp);
}, false);

This is part of http://thedarkrising.com/experiments/orientation/ which also includes a workaround.


Actual results:

tiltLR has its sign reversed (i.e. acceleration.x) on MacBook Pro 8,2. Google Chrome works fine (don't know if they implement any workaround). I tested it on a MacBook from mid-2008 (white ones, non-unibody) and works fine.


Expected results:

It should have the correct sign for acceleration.x.

Apparently this bug is the same or similar to #521848 "Accelerometer on newer MBP have x and y reversed".

Comment 1

[Josh Matthews [:jdm]]

Gross, we may just need to add another hunk like: https://bugzilla.mozilla.org/attachment.cgi?id=405971