On 08/13/2013 11:42 AM, Peter Wu wrote:

On Tuesday 13 August 2013 08:13:17 Peter Hurley wrote:

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On 08/12/2013 05:54 PM, Peter Wu wrote:

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On Thursday 18 July 2013 16:28:01 Peter Hurley wrote:

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Before we revert to using the workaround, I'd like to suggest that
this new "hidden" problem may be an interaction with the xhci_hcd host
controller driver only.

Looking at the related bug, the OP indicates the machine only has
USB3 ports. Additionally, comments #7, #100, and #104 of the original
bug report add additional information that would seem to confirm
this suspicion.

Let me add I have this USB device running on the uhci_hcd driver
with or without this workaround on v3.10.

This problem does not seem specific to xhci, uhci seems also effected.

If true, it would certainly help to have a bug report confirming uhci
failure from a bare-metal system which contained:
1) kernel version
2) complete dmesg output
3) lsusb -v output
4) lsmod output
5) usbmon capture from a plug attempt

I was too fast in drawing a conclusion, besides the kernel I also upgraded
some other packages. Today the issue also showed up in 3.9.9 + updated
packages.

When checking the dmesg, the issue solved by this patch did not occur (the
enumeration was successful).

Thanks for double-checking.

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Today I
upgraded a system (running Arch Linux) from kernel 3.9.9 to 3.10.5. After
a
reboot to 3.10.5, things broke. The setup:

- There are two USB receivers plugged into USB 1.1 ports (different buses
according to lsusb, uhci), each receiver is paired to a K360 keyboard.
- One of the receivers are passed to a QEMU guest with -usbdevice
host:$busid. $devid. This keyboard is working (probably because QEMU
performed a reset). - Since 3.10.5, the keyboard that is *not* passed to
the QEMU guest is not functioning on reboot.

After closing the QEMU guest, the USB bus gets reset(?) after which the
other keyboard suddenly gets detected. I had only booted 3.10.5 twice
before rolling back to 3.9.9, both boots triggered the issue. Do I need
to provide a usbmon, lsusb, dmesg and/ or other details from 3.10.5?

Do both keyboards work on bare metal? Seems like this problem might be
specific to qemu (or kvm) and you may get more insight on those lists.

I haven't tested that, the system automatically boots into openbox + QEMU.
Previously, both keyboards worked on bare metal, so I think it still works.

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Note that there are other Arch Linux users who have reported issues[1][2]

Unfortunately, not even one user in the referenced reports identified
the usb hub the receiver was plugged into.

I've asked it now.

Thanks. And if someone has a uhci failure, filing a new bug on
bugzilla.kernel.org _and_ posting to linux-usb@ and
linux-input@vger.kernel.org improves the chances of the right
people seeing the problem. [xhci already has several reports plus I
subscribed to the kernel bug linked from the ArchLinux bug report.]

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since upgrading to 3.10.z. Triggering a re-enumeration by writing the
magic
HID++ message[3] makes the paired devices appear again (as reported in
forums[1], I haven't tried this on the affected UHCI machine).

While the underlying bug is fixed, can this patch be forwarded to stable?
I see that 3.10.6 has been released, but still without this patch.

This is still a workaround and not really a fix for the underlying bug.

I meant to say, "while the underlying bug is *being* fixed". Anyway, can this
patch be applied to 3.10?

That's really Jiri's call. TBH, I can't blame him for wanting to shake this
out in 3.11 before pushing to stable.

Sorry for the confusion with uhci, looking further it seems that the wrong USB
receiver is being passed to QEMU. It's not a kernel issue, perhaps I can blame
libusbx.

No apologies necessary.

Regards,
Peter Hurley