Open Bug 1849318 Opened 2 years ago Updated 2 years ago

First full-screen video after launch badly positioned in Windows 11

Categories

(Core :: Widget: Win32, defect, P3)

Firefox 116
Desktop
Windows 11
defect

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()

UNCONFIRMED

People

(Reporter: jan, Unassigned)

Details

(Whiteboard: [win:multimonitors][win:fullscreen])

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(1 file)

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I still have this issue on Firefox 116 with Windows 11 22H2, even though the original bug says closed and the comment said fixed.

+++ This bug was initially created as a clone of Bug #1763981 +++

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0

Steps to reproduce:

Using Firefox 99 on Windows 11 Professional build 21H2, without using Firefox profile manager window. That is, opening to selected default profile. Visit a streaming video website and switch video to full-screen view. Tested with YouTube, Vimeo, and Facebook.

I also tested the same steps using a fresh profile and found that if the profile manager window is enabled, it avoids this issue. Using the fresh profile as the default with the profile manager disabled still replicates the issue.

Actual results:

Upon first switch to full-screen after launch, video is positioned incorrectly. Video appears approximately 10px or so offset from top-left corner of screen, leaving background visible along top and left sides. Subsequent full-screen switches are aligned properly even on different websites. This problem occurs every time Firefox is freshly launched.

Expected results:

Video should have filled screen, barring any expected "black bars" due to scaling versus aspect ratio.

"adapterDescription": "AMD Radeon(TM) Vega 8 Graphics"

Well, this is new: previous reports have been strictly on NVIDIA. (And the reverted mitigation only affected NVIDIA machines.) Do you have multiple monitors or multiple GPUs? If you have multiple monitors, does setting them both to the same refresh rate make this go away?

Alternatively, does updating your video drivers help? (Or seem likely to have been a proximate cause?)

"layers.acceleration.disabled": true

If you go to about:config and set layers.acceleration.disabled to false (which should be its default setting), does that prevent the bug?

Flags: needinfo?(jan)

setting layers.acceleration.disabled to false fixes it, but i never changed this setting, so why was it on true?

Flags: needinfo?(jan)

For your other question, i'm using one GPU (integrated laptop gpu). Two Monitors with different resolutions but same refresh rate.
drivers up to date.

(In reply to jan from comment #3)

setting layers.acceleration.disabled to false fixes it, but i never changed this setting, so why was it on true?

I'm not familiar with that area of the codebase, but I suspect it may have been due to a formerly-known-problematic GPU being on a blacklist.

Severity: -- → S3
Priority: -- → P3
Whiteboard: [win:multimonitors][win:fullscreen]

Well, the bug is back for me in Firefox 117, on my home computer and on my company computer. layers.acceleration.disabled is still on false.

removing my theme and using the basic dark theme fixes it again. very weird!

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