Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

USB Problem on (Gentoo) Linux....

Posted on 2004-08-11
Last Modified: 2008-01-09
So, here's the deal:

I think my hardware (USB Port) on my notebook is dying -- however, having said that ....

It seems that *sometimes* Linux notices my Bluetooth USB dongle is in, and other times it does not -- the USB port feels loose, so I attribute it to a bad USB port; however, when I boot into Windows XP, it never has ANY problems ... which makes me back up and say, "While the port might be loose, it seems to be working." (I will note, the USB dongle ALWAYS gets power on the Linux side, too).

SOoooooooooo, I reinstalled BlueZ, updated the kernel, etc.. nothing helps -- about 20% of the time it works (if I do 'shutdown -h now' -- restart that is) ....

Question is -- is there a way to "flush" out the kernel memory, to make sure it knows it's disconnected?  Or, to "restart" the USB "plug and play" from BlueZ ?  I really need this box, as it's a demo box for a Bluetooth app., and going to meetings with a 20% chance of it working is rather embarassing ... buying a new notebook now is out of the questions (lack of $$$$$) ...

My only hope is being able to "reset" the USB or flush the memory to insure the kernel KNOW it isn't connected ....

Any ideas?  (BTW, it used to work without problem and nothing changed software wise, so it is probably the port -- but why does it work on Windows then -- ugh!)

Question by:praefectus
  • 3
  • 3

Accepted Solution

pYrania earned 240 total points
ID: 11770712
It's probably a problem with the kernel's usb driver, which is not a gentoo related problem.

unload the dongle driver and the usb driver afterwards and reload them again in reverse order, that should help.
are you using hotplug?

Author Comment

ID: 11771048
Yeap, using hotplug ....

So, I should unload the BlueZ drivers and then the USB drivers?  How do I unload?  You mean remove and re-install?

Expert Comment

ID: 11771280
rmmod <BlueZ driver> && rmmod usb-(e|u|o)hci
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.


Expert Comment

ID: 11771283
err with hotplug a simple /etc/init.d/hotplugd restart might work also

Author Comment

ID: 11771620
Thanks, I'll give the hotplug restart a try ... that doesn't work, I'll try re-installing, but we've done it twice now -- nothing has changed.  I'll let you know ASAP ...


Author Comment

ID: 13114472
Nothing really helped, as it just might be a USB port (hardware) problem itself ... thanks for helping.

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ifconfig 4 69
winscp where are logs stored 3 51
VMware Tools Install On Linux Problem 3 83
trouble on installing syslog-ng on CentOS 7 7 54
Introduction We as admins face situation where we need to redirect websites to another. This may be required as a part of an upgrade keeping the old URL but website should be served from new URL. This document would brief you on different ways ca…
If you use Debian 6 Squeeze and you are tired of looking at the childish graphical GDM login screen that is used by default, here's an easy way to change it. If you've already tried to change it you've probably discovered that none of the old met…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question