Re: USB disconnects in 2.6.20-rc5 (but improved behaviour over earlier RCs)
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sun, 4 Feb 2007, Pete Zaitcev wrote: > On Mon, 05 Feb 2007 14:16:50 +1100, Matt Doran <[email protected]> wrote: > > > So I'm not sure whether these disconnects are the fault of the hardware > > or the USB layer, but I'd like to help track it down. Is there anything > > that I can do to help track down the cause of the disconnections? Can > > I enable some debugging that might help track down these issues? Or run > > a difference kernel, etc. > > I suppose you can run usbmon constantly and have it dumping the traffic > in a file, if your disk is big enough. Then if the device disconnects, > we'll see the preceeding traffic and may be able to make deductions. > Please look if your system has this file: > /usr/share/doc/kernel-*/Documentation/usb/usbmon.txt > > This is not guaranteed to work, because sometimes devices just disconnect > for no good reason, e.g. if they have bad power or a cables are not shielded > well. But I don't have better ideas. Another possibility is a recently-discovered bug in the USB core. Here is a patch to fix the bug; perhaps it will help solve your problem: http://marc.theaimsgroup.com/?l=linux-usb-devel&m=117068738929326&w=2 Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel