1948574 - Disabling Hardware Acceleration results in offset when using fullscreen video playback

Status: UNCONFIRMED

(Core :: Graphics, defect)

Description

[Abir]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Steps to reproduce:

Disable hardware acceleration.
Play a video in fullscreen, such as on YouTube, Netflix, or Amazon Prime Video.

This issue has a temporary workaround: if fullscreen is disabled then re-enabled (temp fix? only works for the one video, then it repeats again.)

Actual results:

Fullscreen window is slightly offset. Empty areas seen along entire top edge of window and left edge of window.

Expected results:

Video should be fullscreen and not offset.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Mayank Bansal]

Thanks for reporting! To help diagnose this issue better, please can you:

1. Type "about:support" in Firefox and copy-paste its contents here
2. Does this reproduce in a clean profile or Troubleshoot Mode?
3. Capture a log when the issue occurs:

• In Firefox, ideally freshly started with no other tabs, go to about:logging in a new tab
• Select the Media preset
• Enable "stack traces for log messages"
• Click on "Set Log Modules"
• Click Start Logging
• Reproduce the bug
• Back on about:logging, click Stop Logging
• In the new tab that appears with the Firefox Profiler web application, in the top right click the button to upload the profile
• Make sure hidden threads are included and upload, then share the link here or send privately to a Mozilla developer
  -See https://paul.cx/public/about-logging-presentation.webm for a video walk-through

4. If this used to work in an earlier version of Firefox, please do a bisection to find the exact change that caused this (https://mozilla.github.io/mozregression/)
5. Share a screenshot or a screencapture to show exactly the issue you see.

Comment 3

[Abir]

Attachment: about:support raw data

1.

Comment 4

[Abir]

2. This issue does not occur in troubleshoot mode.
3. Logging permalink: https://share.firefox.dev/4jVEcTv
4. This issue has been happening for maybe a year. Not sure which version it started on.

Comment 5

[Abir]

Attachment: Untitled.png

Comment 6

[Paul Adenot (:padenot)]

Moving to graphics, this isn't playback related, more like fullscreen related.

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:bhood, could you have a look please?

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