Agrego un poco de salida de mi log de X: (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32 (==) NVIDIA(0): RGB weight 888 (==) NVIDIA(0): Default visual is TrueColor (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0) (**) Aug 31 08:48:44 NVIDIA(0): Enabling RENDER acceleration (II) Aug 31 08:48:44 NVIDIA(0): Support for GLX with the Damage and Composite X extensions is (II) Aug 31 08:48:44 NVIDIA(0): enabled. (II) Aug 31 08:48:45 NVIDIA(0): NVIDIA GPU GeForce 7300 SE/7200 GS (G72) at PCI:1:0:0 (GPU-0) (--) Aug 31 08:48:45 NVIDIA(0): Memory: 524288 kBytes (--) Aug 31 08:48:45 NVIDIA(0): VideoBIOS: 05.72.22.81.07 (II) Aug 31 08:48:45 NVIDIA(0): Detected PCI Express Link width: 16X (--) Aug 31 08:48:45 NVIDIA(0): Interlaced video modes are supported on this GPU (--) Aug 31 08:48:45 NVIDIA(0): Connected display device(s) on GeForce 7300 SE/7200 GS at (--) Aug 31 08:48:45 NVIDIA(0): PCI:1:0:0: (--) Aug 31 08:48:45 NVIDIA(0): DELL 2009W (DFP-0) (--) Aug 31 08:48:45 NVIDIA(0): DELL 2009W (DFP-0): 165.0 MHz maximum pixel clock (--) Aug 31 08:48:45 NVIDIA(0): DELL 2009W (DFP-0): Internal Single Link TMDS (II) Aug 31 08:48:45 NVIDIA(0): Assigned Display Device: DFP-0 (==) Aug 31 08:48:45 NVIDIA(0): (==) Aug 31 08:48:45 NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select" (==) Aug 31 08:48:45 NVIDIA(0): will be used as the requested mode. (==) Aug 31 08:48:45 NVIDIA(0): (II) Aug 31 08:48:45 NVIDIA(0): Validated modes: (II) Aug 31 08:48:45 NVIDIA(0): "nvidia-auto-select" (II) Aug 31 08:48:45 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 (--) Aug 31 08:48:45 NVIDIA(0): DPI set to (99, 98); computed from "UseEdidDpi" X config (--) Aug 31 08:48:45 NVIDIA(0): option (==) Aug 31 08:48:45 NVIDIA(0): Enabling 32-bit ARGB GLX visuals. (--) Depth 24 pixmap format is 32 bpp (II) Aug 31 08:48:45 NVIDIA(0): Initialized GPU GART. (II) Aug 31 08:48:45 NVIDIA(0): ACPI: failed to connect to the ACPI event daemon; the daemon (II) Aug 31 08:48:45 NVIDIA(0): may not be running or the "AcpidSocketPath" X (II) Aug 31 08:48:45 NVIDIA(0): configuration option may not be set correctly. When the (II) Aug 31 08:48:45 NVIDIA(0): ACPI event daemon is available, the NVIDIA X driver will (II) Aug 31 08:48:45 NVIDIA(0): try to use it to receive ACPI event notifications. For (II) Aug 31 08:48:45 NVIDIA(0): details, please see the "ConnectToAcpid" and (II) Aug 31 08:48:45 NVIDIA(0): "AcpidSocketPath" X configuration options in Appendix B: X (II) Aug 31 08:48:45 NVIDIA(0): Config Options in the README. (II) Aug 31 08:48:45 NVIDIA(0): Setting mode "nvidia-auto-select" (II) Loading extension NV-GLX (II) Aug 31 08:48:45 NVIDIA(0): Initialized OpenGL Acceleration (==) NVIDIA(0): Disabling shared memory pixmaps (II) Aug 31 08:48:46 NVIDIA(0): Initialized X Rendering Acceleration Segun el log las extensiones de Composite estan activadas, o sea, no deberia haber problema al habilitar la transparencia.. pero vaya a saber por que no lo esta soportando. Cualquier pista es bienvenida. -- fede