On Sun, Feb 21, 2010 at 10:27 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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. > Recompiling the kernel with debugfs support, I now have problems reproducing this error message. It still appears, but at most once an hour. Oddly, the same is true for the kernel without debugfs support - the one I used to create the logs attached to the bug report. This surprised me, because the only difference to my system since the initial report was an occasional plugging/un-plugging of a USB memory stick. Since I don't have the slighest idea on how to reliably reproduce the issue, and since the effects I observed and reported in my initial bug filing no longer appear to be valid, I'd like to ask that this bug report be ignored/closed until I can reproduce it in a reliable manner. If there is a general interest in this, I can still attach the usbmon trace. Otherwise, thanks for your time and your help! Duoran -- 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
