Hallo Jeffrey, On Thu, Feb 14, 2019 at 02:06:35PM -0500, Jeffrey Walton wrote:

Hi Everyone,

I'm having trouble using a USB modem. It is a Conexant modem but it is not responding to AT commands. Sample code is at https://pastebin.com/84YUn9ey .

I think the first thing I need to do is verify the kernel configuration for the device. For that:

$ sudo setserial -a /dev/ttyACM0 /dev/ttyACM0, Line 0, UART: unknown, Port: 0x0000, IRQ: 0 Baud_base: 115200, close_delay: 12, divisor: 0 closing_wait: 750 Flags: spd_normal

At this point I think I need to read some kernel docs. I'm not sure if I should be in https://www.kernel.org/doc/Documentation/serial or https://www.kernel.org/doc/Documentation/usb . Looking through the pages nothing jumps out as specific to the Conexant.

Maybe these could be interesting? https://www.kernel.org/doc/Documentation/usb/acm.txt https://www.kernel.org/doc/Documentation/usb/gadget_serial.txt

Can someone suggest what my next steps are to verify the modem's configuration with respect to the kernel and driver?

Thanks in advance.

Best regards, Thorsten

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