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Monday June 28, 2004 Today I tried to take a screenshot of gdm in JDS.
It spent my a few time to find the solution.
Finally, this webpage helped my out.
Here's my steps.
1) edit /etc/X11/gdm/Init/Default, add 1 line, xhost +, before the lastline "exit 0"
2) Restart X (Ctrl+Alt+Backspace). Log in and log out.
3) Ctrl+Alt+F2, switch to text console, log in as root.
4) chvt 7;sleep 2;xwd -display :0.0 -out /tmp/dump.xwd -root
5) After 2 seconds, you will hear two beeps, Now you get your screenshot to /tmp/dump.xwd. You can edit it by gimp.
Another tip of taking screenshot in JDS.
If you want to take screenshot of popup-menu, you can try /usr/bin/gnome-panel-screenshot --delay=5, it will give you enough time to pop up the menu.
If you want to get screenshot of installation screens, I think you must use VMware.