On Sun, 25 Dec 2005, Fisher Yu wrote: > > > I'm doing another test now. In this test, the data is saved in a > > > 'local' IDE disk rather than a USB-IDE disk. If no error occurs in > > > this test, I think there may be a problem in USB side or a bug in > > > cooperating between USB and vedio driver? Otherwise, the bug likely > > > lies in video driver or the application. The testing will last 1 to 2 > > > days. > > > > That's a good idea. > Up to now, I have run this test (write to IDE disk instead of USB-IDE > disk) for 50 hours and 4 times, it worked well. It seems that the > problem relates to USB driver. or maybe the USB-IDE converter? I have > tried three USB-IDE converters (different chip), the current converter > (show "reset" messages) is the better one.
You should try doing the other test, where you use usb-storage for disk I/O but don't do the actual video transfers. > ehci_hcd 0000:01:09.2: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT > usb 2-1: reset high speed USB device using ehci_hcd and address 2 > ehci_hcd 0000:01:09.2: port 1 high speed > ehci_hcd 0000:01:09.2: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT > ehci_hcd 0000:01:09.2: port 1 high speed > ehci_hcd 0000:01:09.2: GetStatus port 1 status 001005 POWER sig=se0 PE CONNECT > > > I have ever seen "reset high speed USB device" message in the output ... > > > > Those resets could be symptoms of a problem with the USB communication. > > They are typically caused by noise in the cable; perhaps replacing the USB > > cable would help. > > I'll check the cable. > > I ever replaced the cable, but still see these "reset" messages. Is it > possible that "reset" relates to USB-IDE converter chip? Certainly it is possible. Some chips are more robust than others; the not-so-good ones need to be reset from time to time. Provided the resets don't occur too frequently and don't interfere very much with the flow of data to/from the disk, they shouldn't matter. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
