[Bug 597919] [NEW] soft lockup in find_audio_control_unit+0x2c/0x6 [snd_usb_audio]0

[Martin Pool]

On 24 June 2010 15:12, Martin Pool <mbp at canonical.com> wrote:
> OK, after digging in to this a bit more, it seems this problem happens
> reliably when the device is connected via the builtin USB3.0/2.0/1.1
> ports, either directly or via the USB hub in a Dell monitor.
>
> The other message I see there is
>
> xhci_hcd 000:02:00.0: ERROR no room on ep ring
>
> If I connect this device to a USB2.0/1.1 port then it works ok
> (including playing sound.)

With "USB Legacy Device Support" turned off in the bios (which means
grub2 doesn't see the keyboard), then I instead get these errors:

usb 8-4: new full speed USB device using xhci_hcd and address 0
xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
....
xhci_hcd 0000:02:00.0: WARN: Stalled endpoint

So it looks like a fairly reproducible bug somewhere in the
intersection of this motherboard, this USB device, and the lucid
kernel.  I've also seen problems using the keyboard from the USB3
ports, but I'm haven't yet dug in to whether they're exactly the same.
 Ask if you want more data.

With "USB 3.0 Controller" off, devices connected to those ports are
just not seen.

-- 
Martin

-- 
soft lockup in find_audio_control_unit+0x2c/0x6 [snd_usb_audio]0
https://bugs.launchpad.net/bugs/597919
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