Bug#994057:

[Sylvain Tgz <tarjaizaid@gmail.com>]

Hello,

Thank you for your reply.
I didn't know graphic rendering specificities of firefox. Thank you
for the information.

I opened the bug on libegl-mesa0 because it was the first packet of
dependencies list.
I using 21.2.1-2 version to try to provide more information for this bug.

To reproduce the issue with firefox :
- right click on tab and use mouse to fly over tab menu.
or
- open a web site and browse it down/up

On my setup, Firefox seems using basic (software rendering) mode by default.
With this basic mode, the issue is present with right click tab and
web site browsing

I tried to use firefox with Webrender (MOZ_WEBRENDER=1 firefox),
right click artifacts are still present, but web browsing doesn't
display artifact.

When using EGL by MOZ_X11_EGL=1 firefox not working, Basic mode is still used

Current mode is checked by about:support and
Graphics/Features/Compositing value.

I tried to provide a capture of the issue by using screen video
recorder "simplescreenrecorder" and when I play the video I cannot see
artifact on the video.
When using remote desktop by VNC, artifact are not present.

This bug couldn't be related between libraries and hardware ?

I found newer application with artifact : VLC, simplescreenrecorder

Sylvain