GLAMOR triggers visual artifacts with nouveau GL backend
Submitted by Eduard Bloch
Assigned to Nouveau Project
Description
Created attachment 120498
Screenshot right 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.
Attachment 120498, "Screenshot right after the hickup":
