The screenshot program i use is “mate-screenshot --interactive”. You can add an icon to the panel and this is the one it supplies. As for hooking it to a control-key, that’s in mate-control-center under hardware/keyboard-shortcuts.
For some reasons, the keyboard shortcut only works if I press and hold the combination of keys for a little while. Meanwhile, pressing the keys does create a weird window.
It is very hard to explain and thus I created this screencast:
Looking forward to any help you can offer. Maybe this is a bug?
In the mean time you can maybe try the workaround described in the github issue:
Write a shell script wrapper for the command with a small delay before.
Save in: /home/you/bin/delay_capture.sh
#! /bin/bash
sleep 1
/usr/bin/mate-screenshot -a
Make it executable:
chmod +x ~/bin/delay_capture.sh
Then use /home/you/bin/delay_capture.sh as the command in the shortcut