848777 - Text on Nightly/Windows 7 x64 looks terrible

Status: RESOLVED DUPLICATE of bug 812695

(Core :: Graphics: Text, defect)

Description

[James Socol [:jsocol, :james]]

Attachment: screen shot of blurred text

In the past few days (maybe a week but not more) Nightly, and increasingly Aurora, has been rendering text as in the attached screenshot.

I can't isolate a specific STR, but a few things seem to fairly reliably trigger it:

* Using Google Spreadsheets
* Switching to a text-heavy tab
* Scrolling a text-heavy tab
* Selecting and unselecting text

I can generally make the problem go away by selecting the text. Sometimes it goes away after a few seconds. It frequently comes back after a few seconds. It just happened to this textarea.

I can't seem to find a meaningful pattern to what text is blurred. In the screenshot you can see it goes line-by-line, not element-by-element. Often several HTML elements together are blurred, while one element will be half-blurred and half-fine.

This is the build identifier:
Build identifier: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:22.0) Gecko/20130306 Firefox/22.0
Built from http://hg.mozilla.org/mozilla-central/rev/216ec69cc531

OS is Windows 7 Ultimate SP1 x64. The about:support graphics data is at the bottom.

I'm going to try installing 32-bit Nightly, as I thought that's what I was running.

====== about:support graphics ======

Graphics

Adapter Description
  ATI Radeon HD 4870 X2
Adapter Drivers
  aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
Adapter RAM
  1024
ClearType Parameters
  DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 50 Enhanced Contrast: 100 ]
  DISPLAY2 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 100 ]
Device ID
  0x9441
Direct2D Enabled
  true
DirectWrite Enabled
  true (6.2.9200.16492)
Driver Date
  10-26-2010
Driver Version
  8.791.0.0
GPU #2 Active
  false
GPU Accelerated Windows
  1/1
Direct3D
  10
Vendor
  ID0x1002
WebGL Renderer
  Google Inc. -- ANGLE (ATI Radeon HD 4870 X2 )
AzureCanvasBackend
  direct2d
AzureContentBackend
  direct2d
AzureFallbackCanvasBackend
  cairo

Comment 1

[Milan Sreckovic [:milan] (needinfo for best results)]

Did you recently update windows, and now have KB2670838 installed?  If so, this is most likely a duplicate of the bug 812695.

Comment 2

[James Socol [:jsocol, :james]]

Yes, KB2670838 was installed on 27 Feb. Marking as duplicate.