** Summary changed: - USB devices are not recognized when having ehci_hcd modprobed + ehci_hcd module causes I/O errors in USB 2.0 devices
** Description changed: - Certain USB devices do not work while the ehci_hcd module is loaded. + Certain USB devices do not work properly, or do not work at all, while + the ehci_hcd module is loaded. A solution is to unload the ehci_hcd module, which is loaded every time the computer starts, using the command 'sudo modprobe -r ehci_hcd'. This works fine but unfortunatly ehci-hcd is necessary for using USB 2.0, so you lose USB 2.0 features. Another solution is to disable USB 2.0 through the BIOS setup. + With some devices it is possible to read files normally (ie. copy files + from an USB pendrive to the computer), but the device disconnects + abrubtly when you start writing data on the device. In some devices it + fails after writing a certain amount of data, probably the size of the + write cache. + Steps to reproduce: - 1. Insert your USB device (like a flash drive) - 2. Comfirm with the 'dmesg' command that it isn't functioning properly. (I/O errors etc) - 3. Remove the USB device - 4. Unload ehci_hcd with 'sudo modprobe -r ehci_hcd' - 5. Insert your USB device again. - 6. Check that everything works. (copy some files, etc.) + 1. Insert your USB 2.0 device (like a flash drive) + 2. If the device is recognised and mounted properly try copying a file to it. + 3. Comfirm with the 'dmesg' command that it isn't functioning properly. (I/O errors etc) + 4. Remove the USB device + 5. Unload ehci_hcd with 'sudo modprobe -r ehci_hcd' + 6. Insert your USB device again. + 7. Check that everything works. (copy some files, etc.) ** Tags added: ehci-hcd -- ehci_hcd module causes I/O errors in USB 2.0 devices https://bugs.launchpad.net/bugs/88746 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
