I just turned on OMTC in a self-built Linux Nightly from today, using the steps in http://mozillagfx.wordpress.com/2012/10/06/how-to-help-testing-off-main-thread-compositing/ (I had layer acceleration on for a while already, and it's looking quite good, so I was happy to step to the next level of testing). I wondered if about:support would show me if I have OMTC on, but found out it doesn't have an entry for that. What I saw though, was that it now shows values that look like acceleration was off and WebGL not present, or at least it shows "no information" there. I can confirm though that WebGL and acceleration work (draw-fps works and BananaBread works). Here's the about:support info with OMTC on: Graphics Adapter Description Tungsten Graphics, Inc -- Mesa DRI Intel(R) Sandybridge Desktop Device ID Mesa DRI Intel(R) Sandybridge Desktop Driver Version 3.0 Mesa 8.0.4 GPU Accelerated Windows 0/5 Basic no information Vendor ID Tungsten Graphics, Inc WebGL Renderer no information AzureCanvasBackend cairo AzureContentBackend none AzureFallbackCanvasBackend none Here's the section with layers enabled but OMTC off: Graphics Adapter Description Tungsten Graphics, Inc -- Mesa DRI Intel(R) Sandybridge Desktop Device ID Mesa DRI Intel(R) Sandybridge Desktop Driver Version 3.0 Mesa 8.0.4 GPU Accelerated Windows 5/5 OpenGL Vendor ID Tungsten Graphics, Inc WebGL Renderer no information AzureCanvasBackend cairo AzureContentBackend none AzureFallbackCanvasBackend none Hmm, looks like "WebGL Renderer" is broken in both cases (BTW, no matter if I call up BananaBread before looking at that page or not, just tried to make sure). Is that a different bug? "GPU Accelerated Windows" seems to break only with OMTC in any case, though.

FYI - WebGL Renderer : no information in about:support was reported in bug 795701

Mass tracking-e10s flag change. Filter bugmail on "2be0fcce-e36a-4e2c-aa80-0e3d33eb5406".

I think this is fixed.

Yes, I think so: Adapter Description Intel Open Source Technology Center -- Mesa DRI Intel(R) Sandybridge Desktop Asynchronous Pan/Zoom none Device ID Mesa DRI Intel(R) Sandybridge Desktop Driver Version 3.0 Mesa 10.5.3 GPU Accelerated Windows 0/5 Basic (OMTC) Vendor ID Intel Open Source Technology Center WebGL Renderer Intel Open Source Technology Center -- Mesa DRI Intel(R) Sandybridge Desktop windowLayerManagerRemote true AzureCanvasBackend cairo AzureContentBackend cairo AzureFallbackCanvasBackend none AzureSkiaAccelerated 0