GNOME Bugzilla – Bug 664722
Alt+` causes strange video artifacts
Last modified: 2011-11-24 13:21:53 UTC
The thick black frame remains anchored at the place it gets displayed first. Window textures start to corrupt each other.
It seems the attachment creation failed. I have a video demonstrating this. Problem is observable on all three machines using nouveau I have.
Video can be seen here: http://dl.dropbox.com/u/877645/screencasts/gnome-bug-664722.webm
You probably have the gconf key /apps/metacity/global_keybindings/cycle_windows set to Alt+` and this binding is handled by the old metacity code which doesn't work correctly under gnome-shell. The default configuration isn't that though so you must have changed something locally. You should set /apps/metacity/global_keybindings/switch_group to "<Alt>Above_Tab" and unset /apps/metacity/global_keybindings/cycle_windows.
This is on a clean install. And this is gnome-shell, not metacity. Are you sure you want me to install gconf-editor?
Not sure why you are getting the rectangle in the first place (alt-` is supposed to show the alt-tab switcher with the window thumbnails active) - did you change the bindings manually? Anyway, it's a known problem which is likely caused by us doing stuff behind GTK's back which GTK+-3 does not like anymore.
*** This bug has been marked as a duplicate of bug 657811 ***
I did not change any of the bindings. Backtick is my "above tab" key.
Sorry, muscle memory. Actually that's indeed alt+esc.