Hi Oliver, > And here's the likely problem. The device cannot do calls. Hence it > is not a modem. To find out more, dmesg is needed. OK, find the output of dmesg below. > Why do you want to use cdc-acm for a device that is not a modem? The hardware is built that way, there's nothing I can do about it. All I want to do is to talk to the (serial) device at the other end. BTW, the device in question is a Crouzet M3 microcontrol, the ST USB-serial bridge is used in their official programming cable. As I said, usbserial doesn't work correctly, and that's no surprise (at least according to G. K-H. in an earlier post that I found once but can't find now). So why doesn't it work with the driver that's auto-loaded, probably for a reason? András Relevant section of dmesg output: [1508624.483470] hub 1-5:1.0: debounce: port 1: total 100ms stable 100ms status 0x101 [1508624.545849] usb 1-5.1: new full speed USB device using ehci_hcd and address 38 [1508624.620034] usb 1-5.1: ep0 maxpacket = 16 [1508624.621569] usb 1-5.1: skipped 4 descriptors after interface [1508624.621805] usb 1-5.1: default language 0x0409 [1508624.622817] usb 1-5.1: udev 38, busnum 1, minor = 37 [1508624.622823] usb 1-5.1: New USB device found, idVendor=0483, idProduct=7270 [1508624.622829] usb 1-5.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [1508624.622834] usb 1-5.1: Product: USB to Serial bridge [1508624.622838] usb 1-5.1: Manufacturer: STMicroelectronics [1508624.623025] usb 1-5.1: usb_probe_device [1508624.623035] usb 1-5.1: configuration #1 chosen from 1 choice [1508624.623231] usb 1-5.1: adding 1-5.1:1.0 (config #1, interface 0) [1508624.623327] usbserial_generic 1-5.1:1.0: usb_probe_interface [1508624.623333] usbserial_generic 1-5.1:1.0: usb_probe_interface - got id [1508624.623344] usbserial_generic 1-5.1:1.0: Generic device with no bulk out, not allowed. [1508624.623360] usbserial_generic: probe of 1-5.1:1.0 failed with error -5 [1508624.623375] cdc_acm 1-5.1:1.0: usb_probe_interface [1508624.623382] cdc_acm 1-5.1:1.0: usb_probe_interface - got id [1508624.623388] cdc_acm 1-5.1:1.0: This device cannot do calls on its own. It is not a modem. [1508624.623429] cdc_acm 1-5.1:1.0: ttyACM0: USB ACM device [1508624.625333] usb 1-5.1: adding 1-5.1:1.1 (config #1, interface 1) [1508624.625497] drivers/usb/core/inode.c: creating file '038' -- 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
