Many devices have limits on the amount of data they can transfer, and if you try to exceed that limit you will most likely crash the device. If you’re not running at USB 2. Learning that two kinds of register interface was one too many, USB 2. Learn how and when to remove these template messages. It’s not USB-specific; Cardbus hotplugging works the same way, and other kernel subsystems should be taking the same approach. Attached scsi generic sg2 type 0 [ Therefore the usb-storage parts of the back-port are not supported.

Uploader: Jugal
Date Added: 16 March 2011
File Size: 42.61 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 68712
Price: Free* [*Free Regsitration Required]

Syslog will usually not be able to save the last few messages before an oops or a hang, since it takes time to read the dmesg output and save it.


That’s a common way for driver bugs to panic kernels, and there are at least three different scenarios to test: It also seems to affect at least Ubuntu and Xubuntu – not sure about Kubuntu. Then comes the sequence of port numbers for each of the intermediate ehck along the path to the device.

It seems some devices do not like this new method though. Device offlined – not ready after error recovery [ Doesn’t seem to say much for Linux when one of the most depended on system buses is completely unreliable.


Linux source code: drivers/usb/host/ehci-hcd.c (v) – Bootlin

Sometimes it makes the keys repeat randomly. Make sure your kernel is up-to-date.

Avoid ehcci problems except with kernels from kernel. Try reproducing this with the most current stable kernel and if that doesn’t work, then the latest pre-release version to see if the bug is still “alive”.

I booted into it and here is the relevent output: It happens to be a hub, and ” In the above example, each of the devices is using configuration 1 and this configuration has only a single interface, number 0. LUN 0 is the only one probed if this kernel option is off, so you’d need to repeat this command as root for every media type your device accepts increasing the LUN number.

You might be able to get the same device to work at high speed on a different machine.

Join Date Oct Beans I have a dell Inspiron with ubuntu jaunty 9. I see whci, which is for wireless devices, right? Each interface gets its own entry in sysfs and can have its own driver.

Linux Kernel Driver DataBase: CONFIG_USB_EHCI_HCD: EHCI HCD (USB ) support

Bus Device All the other entries refer to genuine USB devices and their interfaces. There are currently two UHCI drivers, which don’t always behave the same: If you’ve setup the hotplug scripts it should be there, please report this to the user’s mailing list. If you do not want to do this for all SCSI devices then you can tell the kernel to scan for a specific device using.


Since these use different HCDs, they may behave differently in some situations. Many devices have limits on the amount of data they can transfer, and if you try to exceed that limit you will most likely crash the device.

A hub will never have more than a single interface; that’s part of the USB spec. In other words, the name starts with the bus number followed by a ‘-‘. If it doesn’t, this is the problem: Currently only coldsync works properly with these kinds of devices. The second kind of USB 1.

USB2 trouble: EHCI HCD died

However cdrecord doesn’t know about this maximum length and has no good way to find out, so it uses its default transfer length, which is 63 KB. But other devices can and do have multiple interfaces and sometimes multiple configurations. October 18th, 8. This article has multiple issues. If a computer provides non-x86 USB 1.