from a duplicate of this bug (Bug #24305) here are some comments:
DETAILED DESCRIPTION
---------------------------------
if the screensaver activates while the focus is on an rdesktop window, then
upon exiting the screensaver (either password protected one or not) the mouse
and keyboard are not working (moving the mouse or clicking around or typing
have almost absolutely no effect). The only keys that work are X windows and
gnome shortcuts (like ctrl-alt-L, ctrl-alt-F1 etc).
WORKAROUND
----------------------
Everything comes back to normal if you do either one of the following:
a) if you once again activate and exit the screensaver (by pressing ctrl-Alt-L
for example)
b) if you kill gnome-screensaver
EASY REPRODUCTION
------------------------------
1) Start a session to a windows pc with rdesktop (you don't even need to login)
2) Open a terminal and run the following command then quickly switch to
rdesktop and wait for the screensaver to start
sleep 5; gnome-screensaver-command --activate
--
I lost the control of the desktop when screen saver run
https://launchpad.net/bugs/58093
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