Check the BIOS to see if there's a,"Wake-up on PCI event" option?
There is one, in the APM configuration section of the BIOS.
Power On By PCI Devices [Enabled]
It says +5VSB from the power supply must be able to provide 1A of
current while the computer is sleeping, which presumably is including
the 720ma Asus usually mentions in a manual for waking from a PCI LAN
card.
Since the motherboard is "PCI 2.2" compatible, that means that the
motherboard expects a waking signal called PME on the edge of the
card. For a PCI 2.1 or earlier card, the waking function was sometimes
provided by a separate cable running from a socket on the PCI card
to a socket on the motherboard. In the PCI 2.2 spec, this function
is moved to the PCI connector instead. The unfortunate part is,
Asus motherboards aren't backward compatible (supporting both methods),
so a motherboard either supports one method or the other. The problem
might be that you need a PCI 2.2 compatible modem card ?
Since another poster is having trouble getting a machine to wake from
_external_ modem (by ring indication), I'd say there is something wrong
with the way the BIOS is written, or in the declaration function to
Windows. Since ACPI is a pretty complicated piece of software, this
might be tough to debug on your own. Maybe a copy of "dumppo.exe"
will help ? What you really need is some utility to tell you what
waking events are supported, as far as Windows is concerned. It may
be that Windows is programming the hardware to ignore PME, based on
Windows thinking that the hardware doesn't support ACPI properly.
You may want to contact Asus tech support by phone, and give them all
the info for your machine. By doing this, perhaps a BIOS update some
day will get this function set up correctly.
HTH,
Paul