When I hover over one of the animated tiles on mozilla.org, white blocks appear on the tile. AFAICT this only happens on Windows (I'm on Windows 7), and this also occurs on other sites (e.g. news.163.com with the scrolling jumbotron and on reddit.com)

Fallout from bug 1157745 I believe. Kats do you know of something on file for this already?

(In reply to Kevin Brosnan [:kbrosnan] from comment #3) > Fallout from bug 1157745 I believe. Any particular reason you think this? > Kats do you know of something on file > for this already? Nope, haven't seen this before.

I'm unable to reproduce this on my laptop with Windows 10 nor my desktop PC with Windows 7 on the latest Nightly. Jim, can you please confirm this reproduces with the latest Nightly and then provide your about:support Graphics information?

I can reproduce this on clicking the Android banner. Application Basics ------------------ Name: Firefox Version: 42.0a1 Build ID: 20150727030216 Update Channel: nightly User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 Multiprocess Windows: 1/1 (default: true) Safe Mode: false Graphics -------- Adapter Description: Intel(R) HD Graphics Family Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32 Adapter RAM: Unknown Asynchronous Pan/Zoom: wheel input enabled Device ID: 0x0a16 Direct2D Enabled: true DirectWrite Enabled: true (6.3.9600.17795) Driver Date: 4-29-2015 Driver Version: 10.18.14.4206 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 221817aa Supports Hardware H264 Decoding: true Vendor ID: 0x8086 WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics Family Direct3D11 vs_5_0 ps_5_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0 Important Modified Preferences ------------------------------ gfx.direct3d.last_used_feature_level_idx: 0 gfx.driver-init.appVersion: 42.0a1 gfx.driver-init.deviceID: 0x0a16 gfx.driver-init.driverVersion: 10.18.14.4206 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2

This is mine using a new profile in today's Nightly, Application Basics ------------------ Name: Firefox Version: 42.0a1 Build ID: 20150727030216 Update Channel: nightly User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 Multiprocess Windows: 1/1 (default: true) Safe Mode: false Graphics -------- Adapter Description: NVIDIA Quadro 1000M Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 2048 Asynchronous Pan/Zoom: wheel input enabled ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 100 Device ID: 0x0dfa Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.17292) Driver Date: 10-28-2013 Driver Version: 9.18.13.1269 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 21cf17aa Supports Hardware H264 Decoding: true Vendor ID: 0x10de WebGL Renderer: Google Inc. -- ANGLE (NVIDIA Quadro 1000M Direct3D11 vs_5_0 ps_5_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0 Important Modified Preferences ------------------------------ browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.frecency_experiment: 3 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 7 browser.startup.homepage_override.buildID: 20150727030216 browser.startup.homepage_override.mstone: 42.0a1 dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 42.0a1 gfx.direct3d.last_used_feature_level_idx: 0 gfx.driver-init.appVersion: 42.0a1 gfx.driver-init.deviceID: 0x0dfa gfx.driver-init.driverVersion: 9.18.13.1269 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 media.gmp-eme-adobe.enabled: false media.gmp-gmpopenh264.enabled: false media.gmp-manager.buildID: 20150727030216 media.gmp-manager.lastCheck: 1438027192 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.flash: 1 plugin.state.npatgpc: 1 privacy.sanitize.migrateFx3Prefs: true security.sandbox.content.tempDirSuffix: {606ba8db-a901-4280-b0c1-0f215ba0f4fe}

Can either of you confirm that it stops happening if you set layers.async-pan-zoom.enabled to false (and restart the browser)?

Additionally, can you check a couple of builds for me? > http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-inbound-win32/1437688488/firefox-42.0a1.en-US.win32.installer.exe This build is where bug 1157745 was landed. > http://ftp.mozilla.org/pub/mozilla.org/firefox/tinderbox-builds/mozilla-inbound-win32/1437688249/firefox-42.0a1.en-US.win32.installer.exe This build is the build immediately before bug 1157745 was landed. If it reproduces in the first build but not the second build that would seem to confirm bug 1157745 as the cause, potentially.

1:52.49 LOG: MainThread Bisector INFO Last good revision: 738d8ee106fe 1:52.49 LOG: MainThread Bisector INFO First bad revision: af67b5f73381 1:52.49 LOG: MainThread Bisector INFO Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=738d8ee106fe&tochange=af67b5f73381

Thanks for the regression window! I'm marking this as blocking 1178298 so that we definitely fix it before we let APZ ride the trains.

[Tracking Requested - why for this release]: nominating to track since this is a regression and should prevent APZ riding the trains (as per comment 11).

APZ is nightly only for right now. all-aboard-apz is the metabug for getting rid of the nightly ifdef.

What Kevin said

(In reply to Kevin Brosnan [:kbrosnan] from comment #6) > I can reproduce this on clicking the Android banner. > I was able to repro also by clicking on the Android banner. On my win8 tablet the mouseover does nothing - there's no mousemove listener attached, whereas there is on OS X, so I assume the page is doing some responsive stuff. Anyway, I can repro the issue and it looks like my patch on bug 1189837 fixes it. I'll dupe this over once that reaches m-c.

Please verify that this is fixed on the next nightly. Thanks!