I have a motherboard (Gigabyte 990fxa-ud3) that I want to wake up using a ring event on the COM port, but I am unable to do so. I generate the ring event with an atmega32a.
The BIOS settings are properly set as far as I know: ACPI Suspend Type = S3(STR) Modem Ring Resume = Enabled ErP Support = Disabled PME Event Wake Up = Enabled And the COM port is enabled.
I have tried pushing +5V on the Ring Indicator line for 500ms using atmega32a, but this did not do the trick on this motherboard. On a different motherboard (Asus A7V8X-X) this worked flawlessly.
I tried contacting Gigabyte but I did not get a specific answer. I searched for other methods of generating a ring event and found that one could also generate the characters "RING", but this did not work either.
What other methods can I try?
Thanks in advance,
PS: I hope this is the correct place for this question.