On 07/29/12 10:50, Alan Stern wrote: > On Sun, 29 Jul 2012, James wrote: > >> I have 3.5.0+ >> How can I find out what the problem is with my USB UPS? > > Your logs indicate that the UPS repeatedly disconnects from and > reconnects to the USB bus. At least, that's what it looks like -- it's > hard to say for sure because your logs don't have timestamps > (CONFIG_PRINTK_TIME wasn't enabled). http://pastebin.com/NF7gDEPS >> It noticeably slows down booting. > > It shouldn't interfere appreciably with booting, unless you're waiting > for some other USB device to be detected. All the USB communication > should happen in the background. It does wait until the UPS is stable, I don't know why. > >> This happened on my previous motherboard so I wouldn't be surprised if the UPS doesn't follow the USB spec exactly. > > If you want to get more information about what's happening, you can use > usbmon to record the communications when the UPS is plugged in (see > Documentation/usb/usbmon.txt for instructions). I read the document but I didn't see any way to turn it on while the OS is booting. My UPS only has one disconnect/connect if I unplug/plug in the cable after the OS is done booting. Maybe the UPS is trying to do something and the USB system is not fully initialized. > > Alan Stern -- 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
