725267 - Some backgrounds not drawn correctly when hardware acceleration enabled

Status: VERIFIED DUPLICATE of bug 717302

(Core :: Graphics, defect)

Description

[Olly Hodgson]

Attachment: Screenshot showing the issue on a GitHub commit page.

User Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0a2) Gecko/20120207 Firefox/12.0a2
Build ID: 20120207042017

Steps to reproduce:

When visiting various websites I'm seeing an element's background-color drawn in the wrong place, usually too far from the top of the element. 

The problem goes away if I restart Aurora without hardware acceleration enabled.

This has only happened since I updated to Aurora 12 (i.e. it seems to be a regression from Aurora 11). 

I'm on Windows Vista 32bit SP2, with an ATi Radeon HD 3870 X2. I updated my graphics driver (from 8.920.0.0 to 8.930.0.0), but it didn't fix the problem. 

From about:support:

Name: Firefox
Version: 12.0a2
User Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0a2) Gecko/20120207 Firefox/12.0a2

Adapter Description: ATI Radeon HD 3870 X2
Vendor ID: 0x1002Device ID0x950f
Adapter RAM: 512
Adapter Drivers: aticfx32 aticfx32 atiumdag atidxx32 atiumdva
Driver Version: 8.930.0.0
Driver Date: 12-5-2011
Direct2D Enabled: true
DirectWrite Enabled: true (7.0.6002.18392)
ClearType Parameters: ClearType parameters not found
WebGL Renderer: Google Inc. -- ANGLE (ATI Radeon HD 3870 X2) -- OpenGL ES 2.0 (ANGLE 1.0.0.963)
GPU Accelerated Windows: 1/1 Direct3D 10
AzureBackend: direct2d


Actual results:

When visiting 
https://github.com/Modernizr/Modernizr/commit/b51f17bb717bcbcfe3f918ff95c9ee33c6d3afc0 the background of div class="commit full-commit" only partially fills the box. See the attached screenshot.

I also see the effect on this site, e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=716439 but I need to scroll the page up and down to see it. In this case, clicking outside the Firefox window (e.g. on the desktop) fixes the problem (Firefox redraws the backgrounds in the right place).


Expected results:

The background-color should be drawn correctly, filling the entire box.

Comment 1

[Olly Hodgson]

Attachment: Screenshot showing the issue on a Bugzilla page, this time with all extensions disabled.

Comment 2

[Matthias Versen [:Matti]]

Do you manually enabled azure ?

Comment 3

[Olly Hodgson]

I don't remember doing that, but apparently I did. Setting gfx.content.azure.enabled to false makes the problem go away.

I guess this is an Azure issue then!

Comment 4

[Olly Hodgson]

In fact, this appears to be a duplicate of bug 717302.