I do also get the white screen with this fix, however being that mine is
a personal home desktop I don't have screensaver passwords turned on so
I hadn't really noticed it that much. I just move the mouse and the
white screen goes away and is replaced by the new user's desktop. The
one time that
I was having this problem as well with Feisty and nvidia geforce 6200.
Tried both compiz and beryl and with nvidia-glx and nvidia-glx-new
drivers and was always getting the black screen when changing back to an
already logged in user. I also got this behavior whenever I ran a game
that went to
