Question This article in http://www.supermicro.com/support/faqs/faq.cfm?faq=8467 is also related to the following issue: One Linux CentOS 5 machine (with latest kernel updates) with X7DBU & SIMSO+ (firmware 1.59 – 1.63) has the following problem: No KVM keyboard and mouse is working after Linux Boot, with the following errors detected: hub 1-0:1.0: 6 ports detected usb 1-6: new high speed USB device using ehci_hcd and address 2 usb 1-6: unable to read config index 0 descriptor/start usb 1-6: can't read configurations, error -71 usb 1-6: new high speed USB device using ehci_hcd and address 3 usb 1-6: device descriptor read/all, error -71 usb 1-6: new high speed USB device using ehci_hcd and address 4 usb 1-6: device descriptor read/8, error -71 usb 1-6: device descriptor read/8, error -71 usb 1-6: new high speed USB device using ehci_hcd and address 5 usb 1-6: device descriptor read/8, error -71 usb 1-6: device descriptor read/8, error -71 After flashing the FW: 1.49.02 Firmware from the above FAQ Article, the KVM is working again within Linux: [root@vserv73 ~]# dmesg usb 4-2: new full speed USB device using uhci_hcd and address 2 usb 4-2: not running at top speed; connect to a high speed hub usb 4-2: configuration #1 chosen from 1 choice input: Peppercon AG Multidevice as /class/input/input4 input: USB HID v1.01 Mouse [Peppercon AG Multidevice] on usb-0000:00:1d.2-2 input: Peppercon AG Multidevice as /class/input/input5 input: USB HID v1.01 Keyboard [Peppercon AG Multidevice] on usb-0000:00:1d.2-2 Can you fix this in firmware 1.63, too? Answer The firmware 1.49 in our FAQ is a modified firmware that actually supports USB 1.1 only. That's why it's working in your CentOS 5 kernel. The OS you are using doesn’t seem to support USB 2.0 correctly. Please download the firmware 1.63 with USB1.1 support below to flash your IPMI firmware: SIMxx IPMI firmware 1.63 with USB 1.1: ugsim163-USB1-1.bin You can also use a newer OS like CentOS 5.4. We had tested it without any similar issue. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) 6 F A G FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 11530 Hardware Monitoring: - IPMI Operating Systems: - Linux OS 03/21/11 JC     Print Answer