Automated workaround, putting the following in an executable file in 
/etc/pm/sleep.d/ :
#!/bin/bash
case $1 in
    resume | thaw)
        tty=`ps axo tty,cmd | grep "/usr/bin/X :0"`
        vt=${tty:3:1}
        chvt 1
        chvt $vt
        ;;
esac

Ref  Bug #552246 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-
video-ati/+bug/552246

Not sure if this is a duplicate as I am also seeing screen corruption.

-- 
After resume, screen corruption and invisible mouse cursor ATI Radeon HD 4850 
https://bugs.launchpad.net/bugs/585526
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