On Thu, 10 Apr 2025 09:18:24 +1000 Geoff <[email protected]> wrote:
Package: firefox
Version: 137.0.1-1
Followup-For: Bug #1101967
X-Debbugs-Cc: [email protected]
I can confirm that gfx.webrender.compositor.force-enabled was the offending option and was set to true. This as well as the other mentioned options are now default.
I don't remember changing it but it must have worked ok in previous versions.
Thanks!
I tested an upstream version of Firefox 137 and there the default is to
disable hardware acceleration for webrender on Linux with my hardware.
Despite the general "use default performance settings" being ticked, or
even when ticking manually "use hardware acceleration when available"
the result doesn't change, no hw acceleration is enforced, and the
described bugs don't manifest.
When manually enabling through the "about:config" page the result is the
same, the bugs appear. So the regression is either in upstream Firefox,
or in some other library shipped in Debian Unstable (Mesa comes to mind).
I humbly admit that I am not familiar with Firefox development and can't
make a guess as to what broke. Firefox change-log doesn't strike me as
obviously suspicious in that area.
