Display video (& graphics) with random "image noises" after upgrade to Firefox 89.0

Asked by pleiades-1997 on 2021-06-05

Platform: Raspberry Pi 4, Ubuntu MATE 20.04.2 (Linux 5.4.0-1036-raspi) , Firefox 89.0+build2-0ubuntu0.20.04.2

When displaying video (e.g. youtube) and graphics, the output show "image noises".

I have taken an snapshot and attached an screendump.

The areas enclosed by Thick Black Pencil shows the symtom.

1. Previous version of Firefox ( 75.0+build3-0ubuntu1 ) did not have the problem.

2. Other browser (e.g. Chromium) displaying the same video does not have the problem, so it seems it is Firefox related.

3. In a certain extend, this also affect outside video frames within Firefox evem in Settings page, see second attachment.

Please kindly shine some light.

Attachment 1:
Attachment 2:

For better visual for the attachments see: https://support.mozilla.org/en-US/questions/1338943

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pleiades-1997 (pleiades-1997) said :

Problem disappear after downgrade to Firefox 75.0 build 3 using apt-get install firefox=75.0+build3-0ubuntu1

Request to take out 89.0+build2-0ubuntu0.20.04.2 for the time being until problem solved by Mozilla.org

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pleiades-1997 (pleiades-1997) said :

https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1930982 provide the workaround

Confirmed that setting gfx.webrender.force-disabled to True solve the problem