On Thu, Dec 15, 2005 at 01:16:24PM -0500, Scott D. Davilla wrote: > We too are having long term problems with a spontaneous USB > disconnect hanging khubd. The only way to fix is a reboot. The > hardware is VIA EPIA 1GHz Nehemiah running a stock 2.6.14.3 kernel > with latest 117 test VIA bios. It's not a specific USB driver problem > as is occurs with various USB devices (pen drive, FX2, etc). All are > ehci devices. It's not power, connector, cable or grounding related. > The disconnects only happen running Linux, running Win2K or WinXP > never sees a spontaneous disconnect. The problem also takes from 4 to > 36 hours to occur. This is the important part of trying to reproduce > the disconnect, you must leave the ehci device connected for a long > time, sometimes for up to two days. System load does not matter. The > issue is that same with all versions of kernels that we have tried up > to the current 2.6.14.3. > > I'm looking for help in discovering why the disconnect happens and > possible solutions. We can do the grunt work here, I'm just looking > for pointers from the Linux USB experts on where look and what to > start looking for. > > From what I gather in praying to google over the last six months, > many VIA chipset Linux users are seeing hints of this problem. We > have some systems that never disconnect (rare), some that disconnect > quickly (also rare), some that take much longer (the rest). All the > systems are have identical hardware, identical software.
Via usb controllers are known to have problems :( If you insert a ehci pci card in the machine, does the same problem happen? And, what are the kernel log messages that happen when the disconnect happens (if you enable CONFIG_USB_DEBUG, it would help.) thanks, greg k-h ------------------------------------------------------- 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
