On Mon, 8 Jan 2007, Jon Smirl wrote: > I have a Philips PSC805 external audio device. It is powered via USB. > This device used to work plugged directly into my desktop. Now it is > coming up, initializing, and then shutting down once user space > starts. This happens about 90% of the time but not always. > > If I move the device to a powered hub either 1.0 or 2.0 it always > works and doesn't have a power problem. In the attached lsusb it is > plugged into the 2.0 hub. > > This seems to me to be a problem with power management. Maybe the > device is going into power saving mode when plugged directly into the > desktop. How do you debug something like this?
What shows up in dmesg? What happens if you unplug the device and then plug it directly into the computer? What do you get if you turn on CONFIG_USB_DEBUG? What does the device's entry in /proc/bus/usb/devices say? Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
