On Fri, 19 Feb 2010, Andrew Morton wrote: > > http://bugzilla.kernel.org/show_bug.cgi?id=15320 > > > > Summary: repeated "reset high speed USB device" messages ... > > I recently installed a card reader (Ultron UCR 75in1) which connects to an > > internal USB port. This reader produces or triggers the following message every > > couple of minutes: > > > > usb 7-5: reset high speed USB device using ehci_hcd and address 4 > > > > At first, I assumed a hardware or cable issue, as this was the cause of bug > > #10852 which deals with the same basic issue. However, there is one key > > difference: the messages stop permanently as soon as I insert a card into the > > reader, even if I remove it a few seconds later. > > > > I have observed this behaviour both with my custom kernel (2.6.32.8) and with a > > stock kernel provided by Debian (2.6.30, via backports). The messages appear > > much less frequent - about one every 30 minutes - on the distro kernel. The best approach will be for you to collect a usbmon trace showing what happens when some of those error messages appear and also what happens when you insert a card. Instructions for usbmon are in the kernel source file Documentation/usb/usbmon.txt. It's probably best to use your custom kernel so that you don't have to wait so long for the errors to occur. Attach the usbmon trace to this bug report and reply to this email to let us know when it's ready. 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
