On Sat, 12 Sep 2015, Roland Weber wrote:

> Hi Alan,
> 
> > was added recently; a table of devices that ehci-pci should ignore.  If 
> > you add your device to that list, ehci-pci won't bind to it.  See 
> > bypass_pci_id_table in drivers/usb/host/ehci-pci.c.  Of course, that 
> > also will involve rebuilding part of the kernel...
> 
> Yes, that works! With the patch below applied to kernel 4.2, the EHCI bus
> that causes my problems is gone. The system shuts down without freeze. It's
> a relief to know that I'll be able to install a reliable system on this
> machine. Never mind building a kernel... I've got ample experience now :-)

It would be just as easy -- maybe easier! -- to build a kernel with 
CONFIG_USB_EHCI_HCD disabled.  No patches would be needed.

> Now let's hope that we can find a fix for the actual problem,
> so I can switch back to precompiled kernels some time next year.

Yeah, that looks like it's going to be a very tough problem.  :-(

Alan Stern

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