ATI Radeon 9000
I have solved changing some parameters in the xorg.conf as follow:
---original Dapper "Section Device"---
#Section "Device"
#       Identifier      "ATI Technologies, Inc. Radeon RV250 If [Radeon 9000 
Pro]"
#       Driver          "ati"
#       BusID           "PCI:1:0:0"
#EndSection

---Modified  "Section Device"---
Section "Device"
        Identifier      "ATI Technologies, Inc. Radeon RV250 If [Radeon 9000 
Pro]"
        Driver  "radeon"
        BusID   "PCI:01:0:0"
        Option  "AGPMode" "4"
        Option  "AGPFastWrite" "true"
        Option  "NoAccel" "false"       
        Option  "RenderAccel" "true" 
EndSection

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Screensaver freezes on Dapper (ATI Radeon 8500 LE)
https://launchpad.net/bugs/38181

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