1667442 - Scrolling flickers on long pages

Status: RESOLVED DUPLICATE of bug 1664101

(Core :: Panning and Zooming, enhancement)

Description

[Paul]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

Hardware:

i7-6700k (4/8 cores with Intel HD Graphics 530)
32GB DDR4 RAM
Linux 5.8.11-arch1-1
Xorg / GNOME 3.36
Firefox Nigthly 83.0a1 (2020-09-25) (64-bit)

Enabled the following flags:

layers.acceleration.force-enabled: true
gfx.webrender.compositor: true
gfx.webrender.enabled: true

1.) Go to https://elixir.bootlin.com/linux/v5.8.11/source/kernel/sched/fair.c

2.) Scroll around by dragging the scrollbar around (quickly).

Actual results:

The left/top bar flickers.

Expected results:

No flicker should occur (Chromium does not exert this beahvior.)

I am currently on Firefox Nightly, however I am not sure about "older" versions.

Comment 1

[Paul]

Afaict: This also affects WebRender-disabled Firefox. However, WebRender-enabled Firefox is more snappier, but still flickers.

Comment 3

[Botond Ballo [:botond]]

Actually, sorry, the left / top bars flickering is bug 1664101, which is a recent regression that should be fixed soon.

Bug 1251617 would be the entire page flickering if you drag the scrollbar sufficiently fast, which is a long-standing known issue.