1607059 - Checkerboard background when switching tabs

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect, P3)

Description

[Kuba Orlik]

Attachment: screenshot.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

Open 10+ tabs, switch from one tab to another

Actual results:

The tab switches properly, but for a brief moment a streched checkerbox pattern is visible on screen (see screenshot)

Expected results:

The tab should switch without glitching

Comment 1

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Kris Taeleman (:ktaeleman)]

Hi Kuba,

Could you attach your about:support information?

1. Enter about:support into the address bar.
2. Click the Copy text to clipboard button.
3. Paste the clipboard contents into a text editor like Notepad, and save the file.
4. Click the Attach New File button above the description here to upload the file.

Thanks!

Comment 3

[Kuba Orlik]

Attachment: about:support.txt

sure thing

Comment 4

[Kris Taeleman (:ktaeleman)]

Thanks!

Couple more questions:

1. Does this reproduce consistently? (I can't seem to repro locally)
2. Could you see if it also happens with Webrender disabled?
   To disable webrender:
   open about:config in address bar
   Set gfx.webrender.force-disabled to true
   Restart browser
3. How long does the checkerboard pattern stay on the screen?

Comment 5

[Kuba Orlik]

1. Well, yes and no. Although I can't find any way to reproduce it step-by step from boot-up, when it happens then it's very reliable. By that I mean that it seems that certain tabs become "glitched" and stay that way. Switching to them causes the checkerboard pattern to appear.
2. I will try running with webrender disabled for a few days and will report on results.
3. It's only for a brief moment - it was tricky to even take a snapshot of it, because sometimes it flickers at a high rate

Comment 6

[Dão Gottwald [:dao]]

This was reported on Linux so blocking wr-mac doesn't seem to make much sense?

Comment 7

[Kris Taeleman (:ktaeleman)]

I'm glad someone is paying attention! Thanks :)

Comment 8

[Kuba Orlik]

It seems that after disabling WebRender the problem disappeared.

Comment 9

[Andrew Osmond [:aosmond] (he/him)]

I have observed this on rare occasions, although I have no STR at this time.

Comment 10

[Darkspirit]

Has anyone seen this bug in the last few months?
bug 1565809 has been fixed in 73 or 74 and I haven't seen such problems since then.

(In reply to Kuba Orlik from comment #8)

It seems that after disabling WebRender the problem disappeared.

Please open about:config, set gfx.webrender.all to true and restart Firefox to check if everything is fine now. Thanks!

Comment 11

[Kuba Orlik]

I"m running with gfx.webrender.force-disabled set to false and I haven't seen this issue for a long time. Seems fixed to me!

Comment 12

[Darkspirit]

Great! :)