linux-kernel - Re: [regression] usb: sometimes dead keyboard after boot (was: new errors during device detection)

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Date:	Fri, 29 Aug 2008 19:33:42 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [regression] usb: sometimes dead keyboard after boot (was: new errors during device detection)

Just replying to one comment now, the rest will need more thought :-)

On Friday 29 August 2008, Alan Stern wrote:
> > Two problems:
> > - CONFIG_USB_DEBUG causes such a huge load of output that it is
> > totally unacceptable to have that enabled permanently for a running
> > system
>
> It shouldn't do that.  Almost all of the extra output occurs when
> devices are plugged in or unplugged; during normal operation there
> should be very few extra messages.  (Depending on what USB drivers you
> use, I suppose...)

Here's a snippet of what I got when I enabled USB debug recently:
[...]
Aug  6 22:06:23 faramir kernel: hub 2-0:1.0: hub_resume
Aug  6 22:06:23 faramir kernel: hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
Aug  6 22:06:23 faramir kernel: usb usb1: usb auto-resume
Aug  6 22:06:23 faramir kernel: usb usb1: wakeup_rh
Aug  6 22:06:23 faramir kernel: hub 1-0:1.0: hub_resume
Aug  6 22:06:23 faramir kernel: hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0000
Aug  6 22:06:24 faramir kernel: usb usb2: suspend_rh (auto-stop)
Aug  6 22:06:24 faramir kernel: usb usb1: suspend_rh (auto-stop)
Aug  6 22:06:25 faramir kernel: hub 5-0:1.0: hub_suspend
Aug  6 22:06:25 faramir kernel: usb usb5: bus auto-suspend
Aug  6 22:06:25 faramir kernel: ehci_hcd 0000:00:1d.7: suspend root hub
Aug  6 22:06:25 faramir kernel: hub 2-0:1.0: hub_suspend
Aug  6 22:06:25 faramir kernel: usb usb2: bus auto-suspend
Aug  6 22:06:25 faramir kernel: usb usb2: suspend_rh
Aug  6 22:06:25 faramir kernel: hub 1-0:1.0: hub_suspend
Aug  6 22:06:25 faramir kernel: usb usb1: bus auto-suspend
Aug  6 22:06:25 faramir kernel: usb usb1: suspend_rh
Aug  6 22:06:28 faramir kernel: usb usb5: usb auto-resume
Aug  6 22:06:28 faramir kernel: ehci_hcd 0000:00:1d.7: resume root hub
Aug  6 22:06:28 faramir kernel: hub 5-0:1.0: hub_resume
Aug  6 22:06:28 faramir kernel: hub 5-0:1.0: state 7 ports 8 chg 0000 evt fe00
Aug  6 22:06:28 faramir kernel: usb usb2: usb auto-resume
Aug  6 22:06:28 faramir kernel: usb usb2: wakeup_rh
Aug  6 22:06:28 faramir kernel: hub 2-0:1.0: hub_resume
Aug  6 22:06:28 faramir kernel: usb usb1: usb auto-resume
Aug  6 22:06:28 faramir kernel: usb usb1: wakeup_rh
Aug  6 22:06:28 faramir kernel: hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
Aug  6 22:06:28 faramir kernel: hub 1-0:1.0: hub_resume
Aug  6 22:06:28 faramir kernel: hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0000
Aug  6 22:06:29 faramir kernel: usb usb2: suspend_rh (auto-stop)
Aug  6 22:06:29 faramir kernel: usb usb1: suspend_rh (auto-stop)
[...]

AFAIK I have not enabled anything special in userland when it comes to
USB suspension; this is just a standard boot.
I do have CONFIG_USB_SUSPEND enabled though, so maybe one should not do that
when using USB_DEBUG?
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