Created attachment 120498 [details]
Screenshot just after the hickup
Version:
ii xserver-xorg-v 1:1.0.12-1 amd64 X.Org X server -- Nouveau display
See attached screenshot. How it happens? Everything works normal (except for
some minor glitches like the substring "www." displayed in black-on-black
Terminator resp. Gnome Terminal).
But sometimes (once a week to every couple of days) and usually when Firefox is
in front, the screen suddenly displays lots of garbage. There are no errors in
Xorg.0.log. Usually the fonts in the main HTML area get weird or dots on them
and this stays even when the window is scrolled. Some page areas with other
fonts are sometimes also affected and they look even worse (covered in
stripes). The same applies to the GTK controls. (Note: I use thinice Gtk theme,
this fact might be related).
Anyhow, making Gtk redraw the controls (hover or click blindly) makes them
appear normal but not so with the fonts. Even when I restart Firefox, some tabs
still have areas (randomly!) with garbled letters.
Note: I had a similar issue with the previous version too but it was worse, it
also affected Terminator (Gnome Terminal renderer). Now Terminator seems to
stay unaffected, at least for now.