I can confirm the issue on a a rpi4 running 21.04 (arm64). The suggested
workaround (setting gfx.webrender.force-disabled to True) works.
** Changed in: firefox (Ubuntu)
Assignee: (unassigned) => Olivier Tilloy (osomon)
** Bug watch added: Mozilla Bugzilla #1714511
https://bugzilla.mozilla.org/show_bug.cgi?id=1714511
** Also affects: firefox via
https://bugzilla.mozilla.org/show_bug.cgi?id=1714511
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1930982
Title:
Firefox 89: webrender breaks videos on Raspberry Pi
Status in Mozilla Firefox:
Unknown
Status in firefox package in Ubuntu:
Confirmed
Bug description:
Firefox 89 enabled the Webrender framework by default. Unfortunately,
the GFX drivers on a Pi 4 seem to be non-compliant in a way that
breaks videos - specifically, there will be a lot of primary coloured
artefacts in videos. My guess is that other Raspberry Pi's will also
be affected, but I don't have the hardware available to test. Setting
gfx.webrender.force-disabled to True fixes the issue, so it's fairly
clear where it lies.
Mozilla doesn't seem to provide official builds for Raspberry Pi's (or
Linux/Arm in general), so I think this is an issue to fix in these
packages, rather than upstream. The quick solution would to just set
gfx.webrender.force-disabled to True for the Pi-platforms and be done
with it, but there may be better solutions I don't know about.
Additioal info:
Ubuntu release: 21.04
Firefox package: firefox/hirsute-security,hirsute-updates,now
89.0+build2-0ubuntu0.21.04.1 arm64
Steps to reproduce: Play a video on Youtube, watch the coloured blocks
appear. Then set gfx.webrender.force-disabled to True and restart to verify the
fix.
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