From http://www.jwz.org/xscreensaver/xscreensaver-5.16.tar.gz

[xscreensaver] / driver / xscreensaver.c

diff --git a/driver/xscreensaver.c b/driver/xscreensaver.c
index c608b76402a4318867a403e1e0574fdb80536be1..95f6b2b1f98d669ecc8d8880187eceff1660103d 100644 (file)
--- a/driver/xscreensaver.c
+++ b/driver/xscreensaver.c
@@ -1191,6 +1191,10 @@ main_loop (saver_info *si)
              we would never be able to un-blank it!  We would never
              see any events, and the display would be wedged.
 
+             In particular, without that keyboard grab, we will be
+             unable to ever read keypresses on the unlock dialog.
+             You can't unlock if you can't type your password.
+
              So, just go around the loop again and wait for the
              next bout of idleness.  (If the user remains idle, we
              will next try to blank the screen again in no more than