Quectel EC25A ACPI wakeup after 15 seconds

[Christopher McKenzie]

Hi,

I have a number of Quectel EC25AFAR05A04M4G hooked up to some J1900 
celerons (board info 
https://solutionsdirectory.intel.com/it/node/70126).  When I issue 
acpitool -s (S3), it will resume in 15 seconds. I've narrowed this down 
to the EC25 as it stays asleep when the device is removed.

I've tried a number of things, such as trying to modify the power level 
(as in turning the usb port "off") or the wakeup node in the mapped 
device entry. I've tried toggling the acpi wakeup events to disabled, 
overwriting the the acpid events to be disabled, disable acpi entirely 
and use solely systemd's methods, this all fails. I've looked around the 
BIOS but found no ways to modify this and it seems to do the same thing 
in Windows although the ACPI event that gets fired is listed as 
unknown.  I've also tried disabling all the modem features, 
disconnecting from the APN, and tearing down the network. None of these 
things seem to alleviate the problem.

Has anyone run into this before and if so, do you know of any solutions? 
Thanks!

~chris.