Samsung se-208 USB cdrom device not always detected

[jbt]

EDIT : I changed lsusb answers. Previous ones were with slightly different configurations

I have a raspberry pi 2 Model B, with archlinux and try to connect a samsung se-208 external usb cdrom device. The device is connected to an external usb hub, self powered.

Usually, the device is not detected :
$this->bbcode_second_pass_code('', 'Bus 001 Device 005: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
[alarm@archmusique app]$ lsusb
Bus 001 Device 005: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 007: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 006: ID 059b:047b Iomega Corp.
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
')

After disconnecting and connecting it again, it is sometimes detected (2nd line) :
$this->bbcode_second_pass_code('', 'Bus 001 Device 005: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 008: ID 0e8d:1806 MediaTek Inc. Samsung SE-208 Slim Portable DVD Writer
Bus 001 Device 007: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 006: ID 059b:047b Iomega Corp.
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
')

When the device is detected I got the following (and the device works normally) :
$this->bbcode_second_pass_code('', '[alarm@archmusique app]$ dmesg | tail
[ 858.267923] usb 1-1.3.3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 858.275740] usb 1-1.3.3.1: Product: MT1887
[ 858.280019] usb 1-1.3.3.1: Manufacturer: MediaTek Inc
[ 858.285229] usb 1-1.3.3.1: SerialNumber: S17Y6YAG4005D7
[ 858.298167] usb-storage 1-1.3.3.1:1.0: USB Mass Storage device detected
[ 858.305556] scsi host1: usb-storage 1-1.3.3.1:1.0
[ 859.307656] scsi 1:0:0:0: CD-ROM TSSTcorp CDDVDW SE-208GB TS00 PQ: 0 ANSI: 0
[ 859.368377] sr 1:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[ 859.381351] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 859.389745] sr 1:0:0:0: Attached scsi CD-ROM sr0
')

In the future, the device won't be easily accessible, which means that it has to be detected always. I tried various configurations on the hub (shared with a hdd that works perfectly). Also I updated the whole system (pacman -Syuu)

I would really appreciate any help : I did 99% of my project, and everything works great, but that...

Thanks in advance.

P.S : when detected :
$this->bbcode_second_pass_code('', 'Bus 001 Device 008: ID 0e8d:1806 MediaTek Inc. Samsung SE-208 Slim Portable DVD Writer
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0e8d MediaTek Inc.
idProduct 0x1806 Samsung SE-208 Slim Portable DVD Writer
bcdDevice 0.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 2 SFF-8020i, MMC-2 (ATAPI)
bInterfaceProtocol 80
iInterface 5
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
')

[WarheadsSE]

What is $this->bbcode_second_pass_code('', 'Bus 001 Device 007: ID 059b:047b Iomega Corp. ')

[jbt]

Iomega usb hard drive RPHD-UG 500 Go (I did a mistake in lsusb outputs in my original post : that device didn't disappear spontaneously)

[WarheadsSE]

Odd, that it is not coming up. It might indeed be due to power draw, combined.

Does this happen when the USB HDD is not attached at boot?

[jbt]

I just tried to boot without hdd, but it didn't change anything.

after boot :
$this->bbcode_second_pass_code('', '[alarm@archmusique ~]$ lsusb
Bus 001 Device 005: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 006: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
')

after connecting back hdd :
$this->bbcode_second_pass_code('', 'Bus 001 Device 005: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 006: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 007: ID 059b:047b Iomega Corp.
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
')

... still no samsung

Is it possible do a reboot on an usb device (the hub, which in my case would do the trick) ?

[WarheadsSE]

If it is an external hub, sure. You would probably not want to do the root-hub on the Pi, because it would disconnect everything.