1832444 - Flickering from Hardware Acceleration after upgrading to Firefox 113 and installing Windows Update

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[sdneamtu]

Attachment: firefox-support.txt

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/113.0

Steps to reproduce:

1. Update Firefox to 113 from 112.
2. Upgrade Windows 11 to KB5026372.
3. Browse as normal. Flickering happens

Actual results:

Browser flickers with Hardware acceleration turned on.

Expected results:

No flickering when browsing with Hardware acceleration turned on.

Comment 1

[Ashley Hale [:ahale]]

The about:support text you provided is helpful, but it would be more useful to have one with hardware acceleration turned on.

I will attempt repro on one of my systems today.

It's very likely this is the same bug as https://bugzilla.mozilla.org/show_bug.cgi?id=1638709 but I want to confirm, and I want to know why the mitigation for that is not working, and why it is now happening on Windows 11 (previously we only saw this on Windows 10, modulo a few rare cases on Windows 11 I have witnessed).

Comment 2

[sdneamtu]

Attachment: about:support with hardware acceleration turned on, and unexpected result present.

Comment 3

[sdneamtu]

Attached the about:config with hw acceleration turned on. I should have known better ;)

Don't hesitate to ask if I need to provide any other piece of information that isn't in the text dump.

Comment 4

[Ray Kraesig [:rkraesig]]

This may be related to the switch to FLIP_SEQUENTIAL that was recently introduced in 113, and is already being rolled back in 113.0.1 due to reports of video tearing.

• Do you still experience this with v114 Beta?
• Alternatively, does it go away in 113.0 if you set gfx.webrender.dcomp-apply-1704954 to false?
• Alternatively again, does it go away in 113.0 if you set gfx.webrender.flip-sequential to false instead?

Comment 5

[sdneamtu]

I have not yet checked the v114 beta, but here are some steps I took.

Starting state is with hardware acceleration turned on.

• Setting gfx.webrender.dcomp-apply-1704954 to false and restarting Firefox got rid of the problem.

• If gfx.webrender.dcomp-apply-1704954: false, and gfx.webrender.flip-sequential: true, it isn't broken

• gfx.webrender.dcomp-apply-1704954: true, and gfx.webrender.flip-sequential: false, it isn't broken

• gfx.webrender.flip-sequential: true, and gfx.webrender.flip-sequential: true, it is broken.

Comment 6

[sdneamtu]

I am not seeing issues on version 114.0b3.

Comment 7

[Ray Kraesig [:rkraesig]]

In that case, this should have been resolved by the 113.0.1 update. Feel free to reopen if that's not the case.

I recommend leaving gfx.webrender.dcomp-apply-1704954 set to false permanently unless you experience the NVIDIA driver issues seen in bug 1638709.