Hi, On 29.05.2013 05:32, Grant wrote:
[...]
sd 8:0:0:0: [sdb] Synchronizing SCSI cache sd 8:0:0:0: Device offlined - not ready after error recovery Unplugging and replugging the device does not result in the reappearance of the /dev/sdb device file like it does with my other external drives. The only way to bring the /dev/sdb device file back is to 'modprobe -r xhci_hcd && modprobe xhci_hcd'.
[...] I'm not sure where the problem is exactly but I think it is really a problem with the power down of some USB hardware in the chain. I am wondering why this still exists on your quite new hardware. I see this here on my own (a few years old) laptop with experimenting some power control settings. I think your USB port got power switched off and so can't detect that you have re-plugged a new device. So my idea is, with reloading the kernel module the power is switched on again. Maybe there should be a config option in userspace to disable powerdown and only unmount filesystems if it is not possible to detect powerdown support of hardware?! Best regards, Markus -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
