usb: class: cdc-acm: /dev/ttyACM0 HowTo disable interrupt and control URBs

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Hi,

is it and how is it possible when using the acm_tty that
there is not sent any interrupt or control URB?

My connected device has problems handling this stuff and
doesn't respond to the bulk URB which is timed somewhere
between.

I've found e.g.
URB_NO_INTERRUPT and USBDEVFS_URB_NO_INTERRUPT in
http://code.metager.de/source/xref/linux/stable/drivers/usb/core/devio.c#1386
but how do I set this?

Can it be done with ioctl?
Some notes would be fine.

Thanks a lot
Markus
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