STR: 1) Open the testcase (reduced from http://www.usatoday.com/longform/news/nation/2014/10/09/suicide-mental-health-prevention-research/15276353/) 2) Scroll down and up to hide/display the image Result: Black rectangles on the image. NB: With HWA disabled, the rendering is normal. Regression range: good=2014-10-01 bad=2014-10-02 http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=14665b1de5ee&tochange=2399d1ae89e9

I'm not seeing this on the latest inbound. Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0 Graphics -------- Adapter Description: AMD Radeon HD 7900 Series Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM: 3072 ClearType Parameters: D [ Gamma: 2200 Pixel Structure: R ClearType Level: 0 Enhanced Contrast: 50 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ] Device ID: 0x6798 Direct2D Enabled: true DirectWrite Enabled: true (6.3.9600.17111) Driver Date: 10-4-2014 Driver Version: 14.301.1004.0 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 00000000 Vendor ID: 0x1002 WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon HD 7900 Series Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

It's due to: Bas Schouten — Bug 902952 - Part 2: Use Direct2D 1.1 where available. r=jrmuizel

can repro this. Graphics -------- Adapter Description: AMD Mobility Radeon HD 5000 Series Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM: 512 ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 300 Device ID: 0x68e0 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16571) Driver Date: 9-15-2014 Driver Version: 14.301.1001.0 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 04471028 Vendor ID: 0x1002 WebGL Renderer: Google Inc. -- ANGLE (AMD Mobility Radeon HD 5000 Series Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

And another one, will be tracking all regressions from this that have user-facing impact.

Changing the width of the browser window gives different effects. Sometimes it displays normally, sometimes horizontal black bars. Also widening the browser window has the effect where the bottom of the image is not aligned correctly and it kinda dances back and forth for a while before settling down. AMD R7 240 Adapter Description AMD Radeon R7 200 Series Adapter Drivers aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM 1024 Device ID 0x6613 Direct2D Enabled true DirectWrite Enabled true (6.3.9600.17111) Driver Date 10-4-2014 Driver Version 14.301.1004.0 GPU #2 Active false GPU Accelerated Windows 1/1 Direct3D 11 (OMTC) Subsys ID 00000000 Vendor ID 0x1002 WebGL Renderer Google Inc. -- ANGLE (AMD Radeon R7 200 Series Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote true AzureCanvasBackend direct2d AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0

Looks to be a dupe of bug 1085187.

I cannot reproduce the problem on the following m-i build. https://hg.mozilla.org/integration/mozilla-inbound/rev/0c50940fd16d Mozilla/5.0 (Windows NT 6.1; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0 ID:20141029154215 I can verify that bug 1085187 fixes this problem.