HD 3870 here aswell, running with 1680x1050 resolution and seeing the same issue. 1280x1024 doesn't show the same behaviour but other types of artifacts instead, where GNOME Panels turn black.
It's interesting to note also that when running Blender in fullscreen, switching workspaces stops the screen updates. This same behaviour is in Savage2 if you don't have Grab Input enabled (so you can switch workspaces with hotkeys).
Savage 2 also has a minor issue that the textures or shaders in the login screen with 8.6 are totally bugged now. Ingame it works fine (Aside from the workspace switching).
It's interesting to note also that when running Blender in fullscreen, switching workspaces stops the screen updates. This same behaviour is in Savage2 if you don't have Grab Input enabled (so you can switch workspaces with hotkeys).
Savage 2 also has a minor issue that the textures or shaders in the login screen with 8.6 are totally bugged now. Ingame it works fine (Aside from the workspace switching).
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