Problems with mixed USB Versions (1.1and 2.0) on one single USB hub
This document (3671067) is provided subject to the disclaimer at the end of this document.
Novell Linux Desktop 9 SP3 (Service Pack 3)
SUSE Linux Enterprise Server 9 SP3 (Service Pack 3)
SUSE Linux Enterprise Point of Service 10
SUSE Linux Enterprise Point of Service 11
modprobe -r ehci_hcd
The following steps are necessary to permanently disable the EHCI driver module after reboot:
echo "/sbin/rmmod ehci_hcd">> /etc/init.d/boot.local
echo "install ehci_hcd /bin/true">> /etc/modprobe.conf.local
Additional information for SLEPOS10 and 11 While the above is a necessity on NLPOS9, on SLEPOS 10 and 11 the situation has improved.
The vast majority of devices are working, only a few still need to be run on high speed only.
Only in case a USB device causes trouble, mount the image loopback to e.g. /mnt and run the commands:
- echo "/sbin/rmmod ehci_hcd">> /mnt/etc/init.d/boot.local
- echo "install ehci_hcd /bin/true">> /mnt/etc/modprobe.conf.local
unmount the image and reboot the cash register.
Using an external USB 2.0capable hub with only USB 1.1 devices plugged into itcould also cause problems.
External hubs send all signals from the USB 1.1 devices into an USB 2.0 stream. This means, there is also a mixed environment on the system.
Unloading the EHCI driver is also necessary.
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- Document ID:3671067
- Creation Date:23-MAY-07
- Modified Date:30-APR-12
- SUSESUSE Linux Enterprise Point of ServiceSUSE Linux Enterprise Server
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