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Old 06-20-2005, 03:56 PM   #1
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Registered: Apr 2003
Location: London, UK
Distribution: Gentoo
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Annoying Linux USB uhci_hcd problem

I'm not sure whether this strictly belongs under Hardware, but I can't see any better place to put it...

When I load the uhci_hcd module with no USB devices plugged in, or if I unplug all devices with the module loaded, my system hangs.
It is fine if I have any USB 1 device plugged in (I don't have any USB 2 ones to try), only when there are none connected is there a problem.
ehci_hcd has no problems at all, although, as said before, I don't have any USB 2 devices, and ehci_hcd does not detect USB 1 devs.
I have tried loading uhci_hcd both with and without ehci_hcd already loaded, and with "legacy USB" both on and off in my BIOS.
This problem has happened on various distros, although I have only been able to investigate it properly on my main Gentoo system.
I have tried many kernels from 2.6.11 to 2.6.12, both vanilla and with Gentoo patches, and other distros using those kernels also
hang unless I plug a USB device in. I did not have the problem with kernel 2.6.10. The ports are USB2 ones.
I have managed to capture a log of the crash, using the USB debug option, and putting an endless loop of sync commands after the command to load the uhci_hcd module, in order to get the logs onto the hard drive before the system hung (I did confirm on the console that the log I got had everything that was produced there, with dmesg -n 8). This logged run was with no USB modules loaded beforehand and no USB devices plugged in.

uname -a output:
Linux sodashark 2.6.12-gentoo #2 Mon Jun 20 19:40:08 BST 2005 i686 Intel(R) Pentium(R) M processor 1500MHz GenuineIntel GNU/Linux

URLs with information on problem (all of these are plain text files with DOS EOL):
Latest info on problem -
System log from module load to hang -
Kernel config file -
Old 06-21-2005, 12:02 AM   #2
Registered: Oct 2003
Distribution: Gentoo, Mint, Ubuntu, Vector
Posts: 149

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what does dmesg say?

have you tryed running usbview and finding out some info there?
Old 06-21-2005, 02:53 PM   #3
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Registered: Apr 2003
Location: London, UK
Distribution: Gentoo
Posts: 13

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I have not actually run dmesg itself after loading the module, but I have done dmesg -n 8 beforehand, and checked that no messages appear on the console that have not also got into the kernel log. In case you didn't notice, I have the kernel log uploaded:
I have just installed usbview, but I'm not sure what you want me to do with it... running it after loading the module is completely out of the question, as I only have about 2 seconds before the computer hangs. I might just about be able to copy a proc file to the hard disk and sync before it hangs, if you tell me what file.


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