I can confirm that patch works.
I have ATI Radeon Xpress 200 (integrated with motherboard), Kubuntu Hardy, 
fglrx drivers from repository.
Open source driver works, but without 3D acceleration.

I think it is good idea to release an update. Many people have this
issue, more will come when Hardy will gain popularity.

I have no idea if it works with GDM, should not affect, because in
/etc/ati/authatieventsd.sh function GetServerAuthFile() is checking for
GDM files too. I cannot check it, I haven't access to ati card  - only
for few days now.

/var/run/xauth/A$1* is used with KDM - that 100% sure. What if someone
is using XDM or just startx?

We could add another "if" section, for example:

    # Check xdm

    XDM_AUTH_MASK=/var/lib/xdm/authdir/authfiles/A$1*
    XDM_AUTH_FILE=`ls -t $XDM_AUTH_MASK 2>/dev/null | head -n 1`   # Choose the 
newest file
    if [ -n "$XDM_AUTH_FILE" ]; then
        SERVER_AUTH_FILE=$XDM_AUTH_FILE
        DISP_SEARCH_STRING="#ffff#"
        return 0
    fi

    # Check xdm

    KDM_AUTH_MASK=/var/run/xauth/A$1*
    KDM_AUTH_FILE=`ls -t $KDM_AUTH_MASK 2>/dev/null | head -n 1`   # Choose the 
newest file
    if [ -n "$KDM_AUTH_FILE" ]; then
        SERVER_AUTH_FILE=$KDM_AUTH_FILE
        DISP_SEARCH_STRING="#ffff#"
        return 0
    fi

that will 100% safe :)

-- 
[fglrx] freezes upon Logout or Switch user [patch]
https://bugs.launchpad.net/bugs/118605
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