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
