OK, this seems to be a Xorg bug in the "-background none" feature. Upstream bug
reported here:
https://bugs.freedesktop.org/show_bug.cgi?id=105518
Less likely but still possible is that mutter (used on the login screen)
is corrupting the framebuffer and "Xorg -background none" is then
innocently copying the corruption.
A workaround (which at least will avoid more bug reports from users) is
to remove these two lines from gdm3:
g_ptr_array_add (arguments, "-background");
g_ptr_array_add (arguments, "none");
That will reliably replace the corruption with blackness.
Have a nice day.
** Bug watch added: freedesktop.org Bugzilla #105518
https://bugs.freedesktop.org/show_bug.cgi?id=105518
** Also affects: xorg-server via
https://bugs.freedesktop.org/show_bug.cgi?id=105518
Importance: Unknown
Status: Unknown
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1753776
Title:
Graphics corruption (or distortion?) in login animation to Xorg
sessions
To manage notifications about this bug go to:
https://bugs.launchpad.net/xorg-server/+bug/1753776/+subscriptions
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