859086 - Video hardware acceleration Radeon no longer works properly -- scrolled text illegible

Status: RESOLVED DUPLICATE of bug 812695

(Firefox :: Untriaged, defect)

Description

[Charles Gilbert]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130326150557

Steps to reproduce:

I did nothing. Video hardware acceleration has been working fine for years. As of some weeks back (1-2 months?), Internet text displays strangely. It seems to operate in horizontally blocked chunks, some fine, some blockily distorted, some entirely unintelligible. Scrolling via mouse wheel seems to worsen the problem. I have the same issue on two different computers, both using ATI Radeon hardware, one on a PCI plug-in board, one built into motherboard.

Comment 1

[Charles Gilbert]

Turning off hardware acceleration resolves problem, but makes the grouped tab selection window far less useful. Turning off smooth scrolling seemed to have no affect on rendering quality.

Comment 2

[therube]

This apply in your case:

Bug 812695 - [D2D] Text Rendering Issues due to Windows 7 Platform Update KB2670838 (MSIE 10 Prerequisite)

If so, DUP to it.

Comment 3

[Charles Gilbert]

The display problems that they report sound similar but not the same. I will investigate, take off the Microsoft patch if present and see if that resolves the problem before calling dup or not.

Comment 4

[Loic]

Provide screenshots of the issue, please.

Comment 5

[Charles Gilbert]

I don't see how to do that, not familiar with Bugzilla -- I have a JPEG; how do I upload it?

Comment 6

[Loic]

Click here: https://bugzilla.mozilla.org/attachment.cgi?bugid=859086&action=enter

Comment 7

[Charles Gilbert]

Attachment: Screenshot of problem

Comment 8

[Loic]

Dupe confirmed. Uninstall the MS update KB2670838, especially if you don't use IE10 on Win 7, and keep HWA enabled in Firefox.

Comment 9

[Charles Gilbert]

Attachment: Another screenshot

For whatever reason, the problem is much harder to replicate today. I have seen much worse garble, but these are examples of blocky distortion.