For example on a desktop case the USB ports on the front of the machine may all be on the same bus, while the ports on the back of the machine will normally be a a different bus, or have completely separate +5V supplies for each group of USB 2.0 sockets.Ī low current device as defined by the USB 2.0 standards can draw up to 100mA (1 unit) while high current devices can draw up to 5 units (500mA). USB 2.0 has a maximum current draw available of 500mA, however it should be noted that the +5V on several ports may actually be on the same bus. I am not sure whether this 'solution' comes from using Xfce or Mint (I guess Mint 14 Nadia uses the same kernel as Lubuntu Quantal). Using the same PC/hardware with Linux Mint 14 (Quantal) Xfce, the problem almost disappeared(it happened once since then). On certain occasion only restarting 2 or even 3 times solved it.
Upgrading to that would not be a solution I have used Lubuntu Quantal 12.10 and the same problem happened there as well. I have a dual boot with WinXP: in Windows this never happens, so it is not a hardware issue Or if it is, replugging it solves the problem. I have noticed that on most occasions only the external mouse and keyboard are affected, but not the external HDD. Nov 24 14:06:57 cprq-HP-Compaq-nx8220-PY518EA-ABB kernel: usb 2-2: USB disconnect, device number 2 Nov 24 14:06:57 cprq-HP-Compaq-nx8220-PY518EA-ABB kernel: uhci_hcd 0000:00:1d.0: host controller process error, something bad happened! What counts is at the end I guess: Nov 24 14:06:55 cprq-HP-Compaq-nx8220-PY518EA-ABB kernel: usb 3-1: USB disconnect, device number 3
in var/log/syslog after new occurrence ( with only external wired mouse and keyboard).The event seems entirely random, after reboot it will reappear after many days or weeks or, rarely, after a few hours. Logging out-in does nothing, restart does. I keep it for now as example of the two answers there. I have posted a different version of this problem before. The hdd shows it has tension as it has a light there, and the external mouse flashes for a second when plugged. After re-installing Lubuntu 12.04 system on my laptop an older problem re-emerged after a few days and installation of different programs: without apparent reason the external mouse and sometimes other usb connected devices (including hdd) stop working.
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