Messages in this thread | | | Date | Wed, 26 Jul 2017 11:04:02 -0400 (EDT) | From | Alan Stern <> | Subject | Re: USB disk speed regression WD Elements - with bisect result 22547c4cc4fe20698a6a85a55b8788859134b8e4 |
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On Wed, 26 Jul 2017, Zdenek Kabelac wrote:
> Well I do have 4.13-rc1 kernel - where the only difference is the revert > of mentioned patched - so I can provide probably traces from this one if that > helps anything. > > What is not quite clear to me - why T440 works. > > Could this be in some way related to the fact that T61 is USB2 only old lenovo > machine while T440 works with USB3 (new SuperSpeed USB device number...)
Very likely that is the reason. The hardware is different.
> So maybe there is some time-sensitive logic - where WD Elements > decides to be USB2 or USB3 device ???
The decision has to be agreed upon on both sides -- the drive and the kernel. If you enable debugging in the kernel, we'll have a better picture of what it is deciding to do.
Alan Stern
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