<div class="gmail_quote">On Fri, Jul 29, 2011 at 9:11 AM, Johnny Rosenberg <<a href="mailto:gurus.knugum@gmail.com">gurus.knugum@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> 2011/7/15 NoOp <<a href="mailto:glgxg@sbcglobal.net">glgxg@sbcglobal.net</a>>: > On 07/14/2011 04:59 PM, Johnny Rosenberg wrote: > ... >> Jul 15 01:56:30 EasyNote-MX66 kernel: [56274.949093] usb 1-2: new high >> speed USB device using ehci_hcd and address 89 >> Jul 15 01:56:30 EasyNote-MX66 kernel: [56275.052409] hub 1-0:1.0: >> unable to enumerate USB device on port 2 >> >> So it seems like it's at least trying, but failing for some reason… > ... > After a little googling, most of the 'unable to enumerate' errors seem > to come from hardware issues (low power/dirty usb ports). Just for the > heck of it, can you move it to another usb port, preferably a back usb > port if it is on a desktop? It's a laptop. It doesn't matter which USB port I use. > Reason for asking is that usb ports on the > front of a desktop typically are wired extensions of the motherboard usb > ports (the ones that are connected to the back) & can pick up rf > interference and experience low power. Might also be a faulty cable. Checked with different cables. > You could check the power: > <a href="http://pinouts.ru/Slots/USB_pinout.shtml" target="_blank">http://pinouts.ru/Slots/USB_pinout.shtml</a> > > Also, in one bug report several users seemed to resolve by cleaning the > usb contacts. Shot in the dark, but worth trying. > > Other possibilities: > > 1. Is your bios up to date? Older versions of bios may have difficulty > with newer high speed usb 2.0 devices. I just visited their home page and I couldn't even find my laptop there (I found a lot of other ones though), so I don't know if there is an update somewhere… > 2. If you think you can rule out hardware/cables/power/RFinterference, > then you might try backing down to an older kernel, or trying a newer > kernel to see if there is any change. Also try searching: > <<a href="https://launchpad.net/+search?field.text=unable+to+enumerate+USB+device+on+port" target="_blank">https://launchpad.net/+search?field.text=unable+to+enumerate+USB+device+on+port</a>> Thanks for all tips and advice. In this case the problem seems to be something else though: I have a printer (HP Color Laserjet CM1312 MFP) and I use it with two computers using a USB switch (two computers to one USB device). It's a passive switch and there are two push buttons: On for connecting the printer to my computer, and one for connecting it to my wife's. She has no problems with it whatsoever, but when ”my” push button is pressed, there seems to be some problems on most of the other USB ports, except the one to which I connected my keyboard and mouse (I never use my laptop's built in crap). So I just pressed pressed the ”connect my wife's computer to the printer” button instead and my external drive is now found without any problems each time. The strange thing is that when I connect the printer directly to the USB port the problem does not occur, so I wonder how a passive switch can cause problems like this… Kind regards Johnny Rosenberg $B%8%g%K!<!&%m!<%<%s%P!<%0(B -- ubuntu-users mailing list <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a></blockquote><div> You may have a bad switch. Try changing the connections so your wifes computer is on the button you push to select yours and visa-versa. If the problem changes you know the switch is bad. If it doesn't then you have eliminated that component as a contributor to the problem. Basic black box troubleshooting. </div></div> -- When Government fears the people there is Liberty. When People fear the Government there is Tyranny.