I use Ubuntu 12.04 on my external USB HDD and from the begining when I power off my ubuntu my USB HDD also power off 5 seconds later than my computer. Its good for me. But after some updates Ubuntu USB HDD stay power on. Where I can set this ?
I make changes according Your help but problem is again and after restart I have ..power/control in mode ON. I am not sure but I think that my HDD is usb1.
petat@mujlin:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 04e8:342e Samsung Electronics Co., Ltd
Bus 001 Device 004: ID 152d:2509 JMicron Technology Corp. / JMicron USA Technology Corp. JMS539 SuperSpeed SATA II 3.0G Bridge
Bus 003 Device 002: ID 04f3:0103 Elan Microelectronics Corp.
petat@mujlin:~$ cat /sys/bus/usb/devices/usb1/power/autosuspend_delay_ms
2000
petat@mujlin:~$ cat /sys/bus/usb/devices/usb1/power/control
auto