On Fri, Oct 25, 2013 at 10:34:30AM -0400, Dave Jones wrote: > On Fri, Oct 25, 2013 at 10:27:56AM -0400, Alan Stern wrote: > > On Fri, 25 Oct 2013, Dave Jones wrote: > > > > > Xhci got a lot noisier since I recently updated my phone to the newer version of iOS. > > > Possibly it's related to the new feature where it pops up a dialog on the phone > > > asking if I trust the machine I've plugged into? > > > > > > This is from an 3.12-rc6 kernel: > > > > > > xhci_hcd 0000:00:14.0: Port Status Change Event for port 2 > > > xhci_hcd 0000:00:14.0: resume root hub > > > xhci_hcd 0000:00:14.0: handle_port_status: starting port polling. > > > usb usb3: usb wakeup-resume > > > usb usb3: usb auto-resume > > > hub 3-0:1.0: hub_resume > > > xhci_hcd 0000:00:14.0: get port status, actual port 0 status = 0x2a0 > > > xhci_hcd 0000:00:14.0: Get port status returned 0x100 > > > xhci_hcd 0000:00:14.0: get port status, actual port 1 status = 0x20ae1 > > > xhci_hcd 0000:00:14.0: Get port status returned 0x10301 > > ... > > > > All, or almost all, of these are merely debug-level messages. > > Hmm, somehow I never noticed as much in the past. > Maybe I didn't have USB_DEBUG enabled back then. > > > Besides, how does this differ from what you get when you plug in a > > phone running the older iOS? > > Unfortunatly cron has purged the older logs, so I've not got any examples, > but I'm pretty sure it was less alarming. > > I'll just turn USB_DEBUG back off, I'm not even sure how it got turned on. As I mentioned at Kernel Summit, CONFIG_USB_DEBUG has probably always been on. The 3.12 kernel removed CONFIG_USB_XHCI_HCD_DEBUGGING in favor of dynamic debugging. Normally dynamic debug would be off by default, but CONFIG_USB_DEBUG adds the DEBUG symbol for USB drivers, which turns it on. So, you fix this by turning off CONFIG_USB_DEBUG, or modifying the boot command line to include xhci_hcd.dyndbg="=_" I suspect I'm going to get a lot of complaints about log spew. Hopefully other people can find this message and figure out what happened. Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
