578976 - Can't get a usuable OpenGL context on Intel 965GM

Status: RESOLVED DUPLICATE of bug 571831

(Core :: Graphics: CanvasWebGL, defect)

Description

[Clémence]

User-Agent:       Mozilla/5.0 (X11; Linux x86_64; en-US; rv:2.0b2pre) Gecko/20100715 Minefield/4.0b2pre
Build Identifier: Mozilla/5.0 (X11; Linux x86_64; en-US; rv:2.0b2pre) Gecko/20100715 Minefield/4.0b2pre

I can't get a webgl context on firefox, and can't use webgl at all.

Reproducible: Always

Steps to Reproduce:
Call .getContext("experimental-webgl"); on a canvas.
Actual Results:  
getContext returns null

Expected Results:  
A valid webgl context.

My laptop's graphic card does implement the requirements for OpenGL ES 2.0, and WebGL does work on google-chrome-dev.
Here are version lines from my glxinfo :
OpenGL version string: 2.1 Mesa 7.8.2
OpenGL shading language version string: 1.20

But firefox keeps telling me in the console :
WebGL: Can't get a usable OpenGL context.
Without anymore details.

Comment 1

[Benoit Jacob [:bjacob] (mostly away)]

This is because the current Intel driver doesn't support PBuffers. This is solved by bug 571831 which has a patch making us use FBOs instead of PBuffers. It will be checked in soon.

Side note: future versions of the Intel driver will support PBuffers, I've been told.

Comment 2

[Clémence]

I've seen bug 571831 but didn't knew it would resolve the problem since I tough the presence of GLX_SGIX_pbuffer was sufficient.

Sorry for the duplicate, and thank you for the information.