I currently have Ubuntu 13.10. At some point the default shortcuts Shift+Prn and Ctrl+Shift+Prn stopped working.
Simply pressing Prn (captures the entire screen) works, pressing Alt+Prn to capture only active window works as well, only the shortcut for area clipping doesn't work for some reason.
Some more facts:
- Manually running
gnome-screenshot -aworks as expected!
- Changing the action to another key combo doesn't help
- Disabling the action and instead adding a custom shortcut with the command
gnome-screenshot -aas answered here doesn't help either
Here's a screenshot of my keyboard settings:
P.S. In CompizConfig Settings Manager, the
Commands plugin is turned off
UPDATE @falconer's answer has helped locate the problem, here's the output of a script that simulates key presses and dumps programs that intercept them:
$ xdotool keydown "shift+Print"; xdotool key "XF86LogGrabInfo"; xdotool keyup "Print"; sleep 1; xdotool keyup "shift"; tail /var/log/Xorg.0.log [ 25474.641] (II) Printing all currently active device grabs: [ 25474.641] Active grab 0x4220d336 (core) on device 'Virtual core keyboard' (3): [ 25474.641] client pid 2196 xneur [ 25474.641] at 25474411 (from passive grab) (device thawed, state 1) [ 25474.641] core event mask 0x3 [ 25474.641] passive grab type 2, detail 0x0, activating key 50 [ 25474.641] owner-events false, kb 1 ptr 1, confine 0, cursor 0x0 [ 25474.641] (II) End list of active device grabs
It's obvious from this log that in my case it was xneur (layout switcher program).