1789078 - Rendering issues with moving and animating shadows

Status: UNCONFIRMED

(Core :: Graphics: WebRender, defect, P3)

Description

[Tadeáš Erban]

Attachment: screenshots.tar.gz

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0

Steps to reproduce:

Install firefox nightly (106.0a1 (2022-08-30)) on a debian sid box with a GTX 1650 with nouveau drivers on a 3840x2160 screen.
Open https://www.android-x86.org/

This bug does not appear on every load and disappears with page reload.

Actual results:

Upon opening the menu on the site the decorative box-shadow is rendered incorrectly, in a slightly different way every time. Animations of the shadow's background also changed appearance of the shadow in areas outside the changing background.

Expected results:

The shadow should have been rendered according to specification.

Comment 1

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

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

Comment 2

[Robert Mader [:rmader]]

Thanks for the report! Looks like a nouveau driver issue to me - can you share your about:support? ("Copy text to clipboard" -> paste in a comment here -> bugzilla will ask to make an attachment out it -> yes)

Comment 3

[Tadeáš Erban]

Attachment: about-support.json

Comment 4

[Tadeáš Erban]

Attached the about:support as you asked, but did not paste the text version because it is in czech.

Comment 5

[Robert Mader [:rmader]]

Thanks. Hm, this is surprising: you're running on software rendering (which is usually expected to be correct) - and for WebGL only llvmpipe is reported. AFAIK this should only happen if something about your GPU driver setup is quite broken. Can you enable gfx.webrender.all and post another about:support with that?

Comment 6

[Tadeáš Erban]

Attachment: about-support-2.json

Comment 7

[Tadeáš Erban]

And I do have some weird issues. For example enabling hardware rendering made firefox actually noticably slower than with software rendering alone.