Software :: USB Devices Not Detected In 64 Bit MEPIS 11 OS

Last week, I received a used, older (built ~ 2005 or so) IBM ThinkCentre desktop (machine 8143-2EU) having a Pentium 4 (64 bit), 3.0 GHz CPU. It came with WinXP- 64 bit as the sole OS. When I tested my USB devices with the WinXP OS, they were detected and read. I wiped the WinXP and installed MEPIS 11- 64 bit. [There's only a single Intel Pentium 4, 64 bit CPU known to work for MEPIS 11- 64 bit. It's the Pentium 4 Prescott with EM64T. I don't know if my P4 is that one.] Things seem OK with my MEPIS 11- 64 bit OS except for the times when I plug in USB devices--> they're not detected nor read. In a MEPIS forum, a guy told me to try, after first plugging in the USB devices, running lsusb in Konsole. I do that, the system wakes up, and the USB devices are detected and read. But why do I have to do this to get my system to detect and read the devices? I've made the MEPIS system setting so that all USB devices are automounted when plugged in. Doing that did not correct this problem. As root, in Konsole, I ran hwinfo and noticed that for the USB controllers, the driver - uhci_hcd - is not active. Here's the hwinfo output for one of the USB controllers:

18: PCI 1d.2: 0c03 USB Controller (UHCI)
[Created at pci.318]
UDI: /org/freedesktop/Hal/devices/pci_8086_265a

[code]...

[I suppose or guess that all MEPIS users who don't have this USB-device-detection-and-read problem have uhci_hcd.] To see what would happen as a test, I also used a MEPIS 11- 32 bit Live DVD in this computer having the MEPIS 11- 64 bit OS. When I use the Live DVD, I have the same USB detection-and-read problem! What does that mean? With some USB devices plugged in while I'm using the Live DVD, I'm forced again to run lsusb in Konsole. This wakes up the system so that it detects and reads plugged-in USP devices. Why? Any idea on how to fix this? Does this problem seem more a software one rather than a hardware one?