Hello, I'm using the modem Telit HE910 with cdc-acm driver. I've found that after a suspend and resume of the operating system (e.g. pm-suspend), the modem does not answer anymore. Collecting logs with an usb sniffer, it seems that, unlike the Windows driver, the host does not send the packet SET_FEATURE DEVICE_REMOTE WAKEUP, needed by the modem. I've added few lines of code (in the acm_suspend function) for sending this packet and now things work. According to the USB 2.0 specs it seems to me that this feature should be always requested when suspending a device, so probably the driver behavior is not correct. Does cdc-acm really not support this feature or am I missing some configuration parameters that enable the sending of this request? Thanks, Daniele -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
