980048 - Pandaboard hangs in test_drawDiscardedImage.html

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[James Willcox (:snorp) ([e-mail]) (he/him)]

With bug 939276 applied, we hang in test_drawDiscardedImage.html on the pandaboard. Tracing indicates that it is stuck in eglWaitSync(). The fence object is valid, AFAICT, so looks like a driver bug. It works on every phone I have here locally (none of which are a PowerVR GPU). We should probably disable those fences on PowerVR for now until some workaround can be found.

Comment 1

[James Willcox (:snorp) ([e-mail]) (he/him)]

Attachment: Don't use EGL fences on Pandaboard

This causes us to fallback to glFinish() "fencing" on Pandaboard. Slower, but doesn't hang, at least.

Comment 2

[Kelsey Gilbert [:jgilbert]]

Comment on attachment 8386353 [details] [diff] [review]
Don't use EGL fences on Pandaboard

Review of attachment 8386353 [details] [diff] [review]:
-----------------------------------------------------------------

::: gfx/gl/GLContext.cpp
@@ +628,5 @@
>                  MarkUnsupported(GLFeature::standard_derivatives);
>              }
>  
> +            if (Vendor() == GLVendor::Imagination &&
> +                Renderer() == GLRenderer::SGX540) {

Prefer to drop braces to next line for multi-line conditionals. (see the block below)

Comment 3

[James Willcox (:snorp) ([e-mail]) (he/him)]

https://hg.mozilla.org/integration/mozilla-inbound/rev/6f287c42495b

Comment 4

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/6f287c42495b