[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

[jnygaard]

Yes: Old ports are suddenly playing nice.
I moved two devices to the new controller, one disk and
one host (Dell LCD screen) to which I again added two
disks. In addition, one disk is connected to an old port
(on the motherboard.)

All work with ehci_hcd at full speed. (About 20-30 MB/s 
for these disks.) I have stressed the system by copying 
large amounts (hundreds of GB) between all disks at the
same time, and it all work.

Note that before, all these disks, also those connected 
via the LCD monitor, was not operated properly by the
kernel module. And as I said, even when the disks were
turned off, these "reset errors" were written to the logs,
from time to time.

Note that there are lots of chips & devices in my system,
Seagate, Maxtor and WD disks, USB hosts with Intel ICH9 
and Via chips. The new PCI-card that "solved" the problem
has a Via-chip.

So, I guess I can confirm your last statement, even though
I have not tried different permutations of disks/ports. The
first permutation worked, which I take as a strong indication
that all others also will, since it was not picked specially.

J.O.

-- 
ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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