Will do usbmon in a bit. Updating kernels first... Fedora kernel 2.6.32.9 waits for the device to settle, which it never does:
usb 4-2: new full speed USB device using uhci_hcd and address 4 usb 4-2: New USB device found, idVendor=04e8, idProduct=6640 usb 4-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 4-2: Product: SAMSUNG CDMA Technologies usb 4-2: Manufacturer: SAMSUNG Electronics Bo.,Ltd. usb 4-2: configuration #1 chosen from 1 choice cdc_acm 4-2:1.0: ttyACM0: USB ACM device usb 4-2: USB disconnect, address 4 usb 4-2: new full speed USB device using uhci_hcd and address 5 usb 4-2: New USB device found, idVendor=05c6, idProduct=1000 usb 4-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-2: Product: USB MMC Storage usb 4-2: Manufacturer: Qualcomm, Incorporated usb 4-2: SerialNumber: 000000000002 usb 4-2: configuration #1 chosen from 1 choice scsi7 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 5 usb-storage: waiting for device to settle before scanning
Vanilla kernel 2.6.33 yields:
hub 4-0:1.0: over-current change on port 7 usb 3-2: new full speed USB device using uhci_hcd and address 2 usb 3-2: New USB device found, idVendor=04e8, idProduct=6640 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 3-2: Product: SAMSUNG CDMA Technologies usb 3-2: Manufacturer: SAMSUNG Electronics Bo.,Ltd. cdc_acm 3-2:1.0: ttyACM0: USB ACM device usbcore: registered new interface driver cdc_acm cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters usb 3-2: USB disconnect, address 2 usb 3-2: new full speed USB device using uhci_hcd and address 3 usb 3-2: New USB device found, idVendor=05c6, idProduct=1000 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-2: Product: USB MMC Storage usb 3-2: Manufacturer: Qualcomm, Incorporated usb 3-2: SerialNumber: 000000000002 Initializing USB Mass Storage driver... usbcore: registered new interface driver usb-storage USB Mass Storage support registered.
Vanilla kernel 2.6.33 with usb_storage unloaded, then reloaded with optional_zero_cd=2 yields:
usb-storage: usb_stor_exit() called usb-storage: -- calling usb_deregister() usbcore: deregistering interface driver usb-storage Initializing USB Mass Storage driver... usbcore: registered new interface driver usb-storage USB Mass Storage support registered. usb 3-2: new full speed USB device using uhci_hcd and address 4 usb 3-2: New USB device found, idVendor=04e8, idProduct=6640 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 3-2: Product: SAMSUNG CDMA Technologies usb 3-2: Manufacturer: SAMSUNG Electronics Bo.,Ltd. cdc_acm 3-2:1.0: ttyACM0: USB ACM device usb 3-2: USB disconnect, address 4 usb 3-2: new full speed USB device using uhci_hcd and address 5 usb 3-2: New USB device found, idVendor=05c6, idProduct=1000 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-2: Product: USB MMC Storage usb 3-2: Manufacturer: Qualcomm, Incorporated usb 3-2: SerialNumber: 000000000002 usb-storage: USB Mass Storage device detected usb-storage: -- associate_dev usb-storage: Vendor: 0x05c6, Product: 0x1000, Revision: 0x0000 usb-storage: Interface Subclass: 0x06, Protocol: 0x50 usb-storage: Transport: Bulk usb-storage: Protocol: Transparent SCSI usb-storage: Option MS: option_ms_init called usb-storage: Option MS: device inquiry for vendor name usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes usb-storage: Status code 0; transferred 31/31 usb-storage: -- transfer complete usb-storage: usb_stor_bulk_transfer_buf: xfer 36 bytes usb-storage: Status code 0; transferred 36/36 usb-storage: -- transfer complete usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes usb-storage: Status code 0; transferred 13/13 usb-storage: -- transfer complete usb-storage: Option MS: vendor is not Option or not determinable, no action taken scsi6 : usb-storage 3-2:1.0 usb-storage: *** thread sleeping. usb-storage 3-2:1.0: device found usb-storage 3-2:1.0: waiting for device to settle before scanning usb-storage: storage_disconnect() called usb-storage: -- usb_stor_release_resources usb-storage: -- sending exit command to thread usb-storage: *** thread awakened. usb-storage: -- exiting usb-storage: -- dissociate_dev
Latest upstream vanilla kernel, 2.6.34-rc1-git, yields:
hub 4-0:1.0: over-current change on port 7 usb 3-2: new full speed USB device using uhci_hcd and address 2 usb 3-2: New USB device found, idVendor=04e8, idProduct=6640 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 3-2: Product: SAMSUNG CDMA Technologies usb 3-2: Manufacturer: SAMSUNG Electronics Bo.,Ltd. cdc_acm 3-2:1.0: ttyACM0: USB ACM device usbcore: registered new interface driver cdc_acm cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters usb 3-2: USB disconnect, address 2 usb 3-2: new full speed USB device using uhci_hcd and address 3 usb 3-2: New USB device found, idVendor=05c6, idProduct=1000 usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-2: Product: USB MMC Storage usb 3-2: Manufacturer: Qualcomm, Incorporated usb 3-2: SerialNumber: 000000000002 Initializing USB Mass Storage driver... usb-storage: USB Mass Storage device detected usb-storage: -- associate_dev usb-storage: Vendor: 0x05c6, Product: 0x1000, Revision: 0x0000 usb-storage: Interface Subclass: 0x06, Protocol: 0x50 usb-storage: Transport: Bulk usb-storage: Protocol: Transparent SCSI usb-storage: Option MS: option_ms_init called usb-storage: Option MS: device inquiry for vendor name usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes usb-storage: Status code 0; transferred 31/31 usb-storage: -- transfer complete usb-storage: usb_stor_bulk_transfer_buf: xfer 36 bytes usb-storage: Status code 0; transferred 36/36 usb-storage: -- transfer complete usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes usb-storage: Status code 0; transferred 13/13 usb-storage: -- transfer complete usb-storage: Option MS: vendor is not Option or not determinable, no action taken scsi6 : usb-storage 3-2:1.0 usb-storage: *** thread sleeping. usbcore: registered new interface driver usb-storage USB Mass Storage support registered. usb-storage 3-2:1.0: device found usb-storage 3-2:1.0: waiting for device to settle before scanning usb-storage: storage_disconnect() called usb-storage: -- usb_stor_release_resources usb-storage: -- sending exit command to thread usb-storage: *** thread awakened. usb-storage: -- exiting usb-storage: -- dissociate_dev
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