On Mon, 25 Mar 2013, David Linares wrote: > > Start with usbmon (see Documentation/usb/usbmon.txt). > > Thanks Alan. I have just compiled my kernel with debugfs and usbmon. > I can now easily capture raw text traces after boot-up. But I am interested > in capturing these traces at boot time because that's when the problems > occur. Any way to achieve that? No, there isn't any way. The best you can do is build the host controller driver as a module, and start up usbmon before the module is loaded. > While enabling usbmon, I noticed something that can be related. > There is a config: "Maximum VBUS Power usage" which is currently set to > 300mA in my case. That option (USB_GADGET_VBUS_DRAW) applies only to gadgets. That is, it's meant for the part of the USB stack used in peripherals, not in hosts. > But here is the USB dongle I am using: > > lsusb -v > ... > idVendor 0x148f Ralink Technology, Corp. > idProduct 0x5370 RT5370 Wireless Adapter > .. > MaxPower 450mA > > I guess setting 450mA will sort out my issue number 4 and avoid the > "usb 1-1.1: rejected 1 configuration due to insufficient available bus power" > right? No, it won't have any effect at all. What might help would be to plug the wireless adapter into a powered hub instead of directly into your computer. 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
