Messages in this thread | | | Date | Thu, 27 Dec 2012 18:18:16 -0500 (EST) | From | Alan Stern <> | Subject | Re: Regression in kernel 3.8-rc1 bisected to commit adfa79d: I now get many "unable to enumerate USB device" messages |
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On Thu, 27 Dec 2012, Larry Finger wrote:
> I could not do exactly the experiment that you wanted, as ehci-hcd was loaded > even though it was blacklisted. Rather than solve that problem, I generated a > kernel from just before commit adfa79d with ohci-hcd built in and ehci-hcd as a > module. This one generated the errors, but they stopped when ehci-hcd loaded. I > also tested a 3.8-rc1 kernel with ehci-hcd and ehcd-pci built in and ohci-hcd as > a module. No errors for that one. Your hypothesis looks correct. > > I hope there is some way to force ehci-pci to load as soon as ehci-hcd is > loaded, and before ohci-hcd loads, but if there is not, I know how to prevent > the errors on my system even though this solution won't help the users of distro > kernels. At least this time the errors stop once all 3 modules are loaded, and > the number of error outputs is limited.
This is now a userspace issue. Perhaps a change to a udev rule will prevent ohci-hcd from loading until ehci-pci is in place. Or a change to a startup script in your initramfs. However the problem gets solved, there doesn't seem to be much the kernel can do about it.
Alan Stern
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