Hi: I am using Dell Wirless 5530 (Ericsson F3507g) card on kernel 2.6.31. And found that /dev/ttyACM0 can not be accessed. Command: cat /dev/ttyACM0 Result is : cat: /dev/ttyACM0: Input/output error I opened debug in cdc_acm.c and got below message: [ 102.138299] drivers/usb/class/cdc-acm.c: Entering acm_tty_open. [ 102.138907] drivers/usb/class/cdc-acm.c: disconnected from network [ 102.138962] drivers/usb/class/cdc-acm.c: acm_control_msg: rq: 0x22 val: 0x3 len: 0x0 result: 0 [ 102.139042] drivers/usb/class/cdc-acm.c: Entering acm_rx_tasklet [ 102.139054] drivers/usb/class/cdc-acm.c: acm_rx_tasklet: ACM not ready [ 102.139352] drivers/usb/class/cdc-acm.c: acm_control_msg: rq: 0x22 val: 0x0 len: 0x0 result: 0 [ 102.139430] drivers/usb/class/cdc-acm.c: acm_ctrl_irq - urb shutting down with status: -2 BTW: The related devices exported from sys is listed: /sys/class/net/usb0/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard NetworkAdapter /sys/class/tty/ttyACM0/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard Modem /sys/class/tty/ttyACM1/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard Modem 2 /sys/class/tty/ttyACM2/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard GPS Port /sys/class/usb/cdc-wdm0/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard /sys/class/usb/cdc-wdm1/device/interface : Dell Wireless 5530 HSPA Mobile Broadband Minicard PC SC Port I am using linux-2.6.31 official release from kernel git tree I did not meet the issue on 2.6.30 kernel and my FC10 kernel 2.6.27.5-117.fc10.i686 Some one can help on this? Thanks! -- 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
