Re: How to make Modem Manager ignore non-modem USB serial devices?

[Dan Williams <dcbw redhat com>]

On Fri, 2013-04-26 at 05:01 -0700, Paul Stoffregen wrote:
> What is the current recommended way to request the Modem Manager ignore 
> a USB serial device which is not a modem?
>
> Until recently, this udev rule worked.
>
> KERNEL=="ttyACM*", ATTRS{idVendor}=="16c0", 
> ATTRS{idProduct}=="04[789]?", MODE:="0666", ENV{ID_MM_DEVICE_IGNORE}="1"
>
> I've had at least 3 users report problems which appear to be related to 
> newer versions of the Modem Manager apparently no longer respecting 
> ENV{ID_MM_DEVICE_IGNORE} and opening the device shortly after it enumerates.

> From a quick look that rule should work, but remember you want to tag
the entire *USB device*, not just the serial port.  udev rules parsing
changes might also affect whether or not this works.  In any case, run
'udevadm control --export-db' and check whether the USB device parent of
the serial port actually has ID_MM_DEVICE_IGNORE defined.

Dan