Cannot get WoL to work on a Dell Inspiron laptop

[Gustavo Narea]

Hello, everyone.

I have a Dell Inspiron 6400 laptop powered by Ubuntu 9.04 and I'm having trouble to get Wake-on-LAN (WoL) to work.

The hardware is as follows:

• NIC: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02).
• Motherboard:

    *-core                                                                                 
         description: Motherboard                                                          
         product: 0KD882                                                                   
         vendor: Dell Inc.                                                                 
         physical id: 0                                                                    
         serial: .H15QMB1.CN486436787979.                                                  
       *-firmware                                                                          
            description: BIOS                                                              
            vendor: Dell Inc.                                                              
            physical id: 0                                                                 
            version: A06 (06/09/2006)                                                      
            size: 64KiB                                                                    
            capacity: 512KiB                                                               
            capabilities: isa pci pcmcia pnp upgrade shadowing cdboot bootselect int13floppy720 int5printscreen int9keyboard int14serial int17printer int10video acpi usb agp smartbattery biosbootspecification netboot

In the BIOS there's nothing about WoL, but according to ethtool, it IS supported. I have an script that enables WoL on startup and according to the following output, it's certainly enabled:

gustavo@paris:~$ sudo ethtool eth0
Settings for eth0:                
        Supported ports: [ MII ]  
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
        Supports auto-negotiation: Yes                      
        Advertised link modes:  10baseT/Half 10baseT/Full   
                                100baseT/Half 100baseT/Full 
        Advertised auto-negotiation: Yes                    
        Speed: 100Mb/s                                      
        Duplex: Full                                        
        Port: Twisted Pair                                  
        PHYAD: 1                                            
        Transceiver: internal                               
        Auto-negotiation: on                                
        Supports Wake-on: g                                 
        Wake-on: g                                          
        Current message level: 0x000000ff (255)             
        Link detected: yes

But no matter how I shut down the computer (e.g., "echo mem > /sys/power/state", "sudo halt", "sudo halt -p", "sudo halt -f -p", "sudo pm-suspend", "sudo pm-hibernate"), it never wakes when I run any of the following commands from another computer in the same home network:

• wakeonlan 00:15:c5:a7:f0:19
• wakeonlan -p 7 00:15:c5:a7:f0:19
• wakeonlan -i 192.168.1.128 00:15:c5:a7:f0:19
• wakeonlan -p 7 -i 192.168.1.128 00:15:c5:a7:f0:19

What else can I try to make Wake-on-LAN work on this computer?

Thanks in advance!