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SubjectRe: Regression in kernel 3.8-rc1 bisected to commit adfa79d: I now get many "unable to enumerate USB device" messages
On 12/25/2012 10:26 AM, Alan Stern wrote:
> On Mon, 24 Dec 2012, Larry Finger wrote:
>> The problem has been bisected to commit adfa79d entitled "USB: EHCI: make
>> ehci-pci a separate driver". The symptom is that my NVIDIA controller again
>> reverts to unended logging of messages of the form "hub 2-0:1.0: unable to
>> enumerate USB device on port 5".
> A few more details would be helpful, such as the dmesg log (with
> CONFIG_USB_DEBUG enabled). As it is, I don't see how that commit could
> cause this problem. It should not have resulted in any changes in
> behavior -- all it did was split up a driver that was one module into
> two modules.
>> This behavior was previously fixed with commit c618759.
> That commit affected the ohci-hcd driver, whereas this one affects
> ehci-hcd. They can't possibly be related.


You are the expert, but I am confident of my bisection. A kernel built from
commit 3e02320 does not have the problem, but commit adfa79d does.

The dmesg output with CONFIG_USB_DEBUG enabled is posted at

Thanks for looking at this.


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