734297 - about:support incorrectly says I get no WebGL because I don't have EXT_texture_from_pixmap

Status: RESOLVED DUPLICATE of bug 653102

(Toolkit :: General, defect)

Description

[Zack Weinberg (:zwol)]

On my Linux desktop, WebGL is currently blacklisted because the Nouveau driver is buggy (see bug 729817).  However, in trunk, about:support reads

| Adapter Description     nouveau -- Gallium 0.4 on NV94
| Vendor ID               nouveau
| Device ID               Gallium 0.4 on NV94
| Driver Version          2.1 Mesa 7.11.2
| WebGL Renderer          Blocked for your graphics driver version.
|                         Try updating your graphics driver to version
|                         <Anything with EXT_texture_from_pixmap support>
|                         or newer.

The "try updating your graphics driver" message is supposed to read

|                         Try updating your graphics driver to version
|                         <Not the Nouveau driver>

I just wasted nearly an hour trying to figure out why EXT_texture_from_pixmap wasn't being detected successfully, when in fact it _is_, but the message is wrong.

(I don't see any component specifically for about:support)

Comment 1

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

Known problem: our blacklisting code does some excessive caching of stuff. See bug 653102.

Comment 2

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

Also, I'm very sorry you wasted nearly an hour because of that.

Comment 3

[Zack Weinberg (:zwol)]

It wasn't totally wasted; I have a much better understanding of how we probe GL on X now.  I appreciate the sentiment, though.

I'm kinda thinking there should be a way to get the raw glxtest report dumped to stderr -- that would have saved some effort.

Comment 4

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

I'd accept a patch doing that (probably commanded by an environment variable). But note that glxtest currently redirects its stderr /dev/null to avoid polluting firefox's stderr output, so you would have to change that too when that env var is defined.