On Saturday 08 January 2005 14:51, Alan Stern wrote: > ... > I see you didn't have CONFIG_USB_STORAGE_DEBUG set when you ran this test.
Actually I did. I do not know what log level the USB debug messages were, but the silly syslog did not capture them. Now I have set it to write all kernel messages. > Or else you didn't have your syslog daemon configured to store the > debugging messages. If you can get anything unusual to happen with the > debugging enabled, it would make things much easier to track down. That is right. I am trying to trigger the bug, and I have ensured that the USB debug messages are being written to the log file. But I have not triggered the bug yet. > ... > > Jan 8 12:35:10 desktop kernel: ehci_hcd 0000:00:10.4: port 5 reset error > > -110 Jan 8 12:35:10 desktop kernel: hub 1-0:1.0: hub_port_status failed > > (err = -32) > > Jan 8 12:35:10 desktop kernel: ehci_hcd 0000:00:10.4: port 5 reset error > > -110 Jan 8 12:35:10 desktop kernel: hub 1-0:1.0: hub_port_status failed > > (err = -32) > > Those errors are quite unusual. They seem to indicate there's a problem > with your computer's USB hardware, as do the numerous spontaneous (?) > disconnections in your log. However I'm not familiar with all the details > of the EHCI driver. It's faintly possible that plugging the drive into a > different USB port would work better. The numerous disconnections (because without debug, I can trigger the D state process and oops within a dozen connection/disconnection, but with debug it takes 10 times more connection/disconnection to trigger D state process, and I do not know how many are needed for oops :-( ) are purposefully generated to trigger the bug. Of course UHCI (USB 1) is not as fast as EHCI (USB 2). Would that not matter for CD/DVD burning? > If you still can't get anything with the debugging option, try running > without the debugging code and rmmod ehci-hcd before plugging in the > device. Maybe if you use a UHCI controller instead the errors won't > occur. OK I shall try with UHCI. Thank you. Hari ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
