Bug#782442: USB3 external HDD not recognized [regression]

[Ralf Jung <post@ralfj.de>]

Hi,

>>> Indeed doing "echo 'on' | sudo tee /sys/bus/pci/devices/*/power/control"
>>> fixes the problem: When I subsequently plug in the disk, it is
>>> recognized correctly. I confirmed this with an older kernel (the 3.16
>>> Debian kernel, to be more precise). That's good to know, now I don't
>>> need to reboot to a different kernel anymore to do fast backups ;-)
>>
>> Is there any news on this? Any further information I can provide to help
>> fix the issue?
>>
> 
> I got some untested and not yet reviewed usb3 resume race fixes from Zhuang Jin Can
> If you can try them out and see if they help it would be great.
> They are sitting in a topic branch called "xhci_usb3_pm_fixes" in my tree:
> (5 extra patches on top of current usb-linus)
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git xhci_usb3_pm_fixes

This is my production and (main and only) work machine. If you tell me
testing that branch is safe and won't mess up my file systems or
hardware, I can give it a try.

Kind regards,
Ralf

> 
> If not, then the we need to change xhci resume code so that we resume the roothubs as default
> except if we are runtime suspended and woken up just to be (system) suspended.
> 
> -Mathias
> 
> 
>  
>