769957 - YouTube Videos Distorted After Navigating Page When Hardware Acceleration Enabled

Status: RESOLVED DUPLICATE of bug 762948

(Firefox :: General, defect)

Description

[u279673]

Attachment: Distorted Video #1 - Dark Background

When visiting YouTube and watching a video, and navigating the page (whether via arrow keys or mouse scroll) past the video, the video becomes distorted.

Examples of this bug include:

1. Surrounding black bars missing at the very top portion
2. The part of the page immediately above being replicated on top of the video
3. The controls at the bottom being cut in half.

This only happens when YouTube uses Flash. (YouTube always seems to randomly pick Flash or HTML5 for me, and it hasn't picked HTML5 in a while for some reason.)

This is also true when all Firefox extensions are disabled. Flash is the only browser plugin I leave enabled (I enable others like Java when I need them). 

Disabling hardware acceleration (or running in Safe Mode) solves the problem.

Running:

Browser: Firefox 14 (Beta)
Flash Plugin Version: 11,3,300,262
OS: Windows 7 Ultimate 64-bit
GPU: NVIDIA GeForce GT 220

Comment 1

[u279673]

Attachment: Distorted Video #2 - Light Background

Comment 2

[u279673]

Should also mention, there are no problems on MSIE9 on the same system. The latest version of Flash for MSIE is 11,3,300,257.

Comment 3

[Matthias Versen [:Matti]]

what happens if you disable the protected mode in flash ?
- http://forums.adobe.com/message/4468493 (scroll down to "Last resort")

Note: IE Flash doesn't matter because it's a different plugin (NPAPI vs ActiveX).
The protected mode is a new feature in the latest Flash version that Adobe released at the same time as we release FF13 and it's only available for Firefox.

I'm pretty sure not a Gecko bug if it works for most people (like me) and disabling the hwa fixes this. This is either a graphic driver issue or a flash issue.
Post the graphic section from about:support here if disabling the protected mode doesn't help.
Depending on your driver version of your graphic card you should consider an update.

btw: Thank you for including all necessary information in your report like the Flash version.

Comment 4

[u279673]

IMPORTANT NOTE: By hardware acceleration I mean the "Firefox Options" setting, *not* the Flash "Settings..." when right-clicking the video.

Protected Mode suggestion works.

So two solutions exist:
1. Disable hardware acceleration (Firefox Options, not Flash Settings)
2. Disable Flash Protected Mode, leaving Firefox Options untouched. (Security risk?)

NVIDIA driver is v301.42, which is the latest version for my GPU and OS. It was released 5/22/2012 (about a month ago), and I never had this problem until recently.

If you need the about:support Graphics section, here it is:

Adapter Description: NVIDIA GeForce GT 220
Vendor ID: 0x10de
Device ID: 0x0a20
Adapter RAM: 1024
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Driver Version: 8.17.13.142
Driver Date: 5-15-2012
Direct2D Enabled: false
DirectWrite Enabled: false (6.1.7601.17789)
ClearType Parameters: ClearType parameters not found
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GT 220 ) -- OpenGL ES 2.0 (ANGLE 1.0.0.1041)
GPU Accelerated Windows: 0

Comment 6

[u279673]

NOTE: "Direct2D/DirectWrite Enabled: true" when Hardware Acceleration is enabled. Turning it off resets it to "false", even after selecting the button, until you restart the browser.