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Thanks for trying to help. I did restart X properly and the Composite extension is running (fglrx reports it has deactivated DRI due to the enabled composite and xdpyinfo lists it too) but Damages and XFixes are not. I even put the following in the config file:
Option "Composite" "Enable"
Option "XFIXES" "Enable"
Option "DAMAGE" "Enable"
and in the logfile I get:
(**) Extension "DAMAGE" is enabled
(II) Initializing built-in extension DAMAGE
yet xdpyinfo doesn't list Damage and xcompmgr and luminocity complain that they need the Damage extension. I'm really puzzled about this.