Low-power USB only in Debian
Hi,
I am doing tests with a usb HD. It's suposed to obtain enery from the
usb only, but there is another cable to obtain more energy from
another usb when the computer is a laptop with low power usbs.
The fact is that when I use it in windows in aonther laptops or pcs,
and in mac os x in this iBook i have full power usb, but running
Debian, I need to plug the other cable because if i dont it mounts the
disk but it loses the device in about 10,15 seconds or less, sometimes
in 1 or 2 seconds. During that seconds I can use it normal.
When I plug the second cable to the other usb i ve no problem.
This is the syslog output:
Apr 8 18:21:47 localhost kernel: Vendor: TOSHIBA Model: MK8025GAS
Rev: 0000
Apr 8 18:21:47 localhost kernel: Type: Direct-Access
ANSI SCSI revision: 00
Apr 8 18:21:47 localhost kernel: SCSI device sda: 156301488 512-byte
hdwr sectors (80026 MB)
Apr 8 18:21:47 localhost kernel: sda: Write Protect is off
Apr 8 18:21:47 localhost kernel: sda: Mode Sense: 27 00 00 00
Apr 8 18:21:47 localhost kernel: sda: assuming drive cache: write through
Apr 8 18:21:47 localhost kernel: SCSI device sda: 156301488 512-byte
hdwr sectors (80026 MB)
Apr 8 18:21:47 localhost kernel: sda: Write Protect is off
Apr 8 18:21:47 localhost kernel: sda: Mode Sense: 27 00 00 00
Apr 8 18:21:47 localhost kernel: sda: assuming drive cache: write through
Apr 8 18:21:48 localhost kernel: sda: sda1 sda2
Apr 8 18:21:48 localhost kernel: sd 19:0:0:0: Attached scsi disk sda
Apr 8 18:21:48 localhost kernel: sd 19:0:0:0: Attached scsi generic sg0 type 0
Apr 8 18:21:48 localhost kernel: usb-storage: device scan complete
Apr 8 18:21:50 localhost kernel: 18:0:0:0: rejecting I/O to dead device
Apr 8 18:21:50 localhost kernel: 18:0:0:0: rejecting I/O to dead device
Apr 8 18:21:50 localhost kernel: FAT: Directory bread(block 38160) failed
Apr 8 18:21:50 localhost kernel: 18:0:0:0: rejecting I/O to dead device
Apr 8 18:21:50 localhost kernel: FAT: Directory bread(block 38161) failed
Apr 8 18:21:50 localhost kernel: 18:0:0:0: rejecting I/O to dead device
Apr 8 18:21:50 localhost kernel: FAT: Directory bread(block 38162) failed
With Mac OS X ive no problem powering the disk with one cable only.
Somebody has any idea about what can I do?
Thanks for your time.
Saladino
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