I am having this problem where out of the blue my mouse and UPS will stop functiong. Once this even occurs I will find multiple messages like: Jan 15 10:40:32 nureyev kernel: drivers/usb/input/hid-core.c: control queue full Jan 15 10:40:42 nureyev kernel: drivers/usb/input/hid-core.c: control queue full iin /var/log/messages. The only way I can get the mouse and UPS back is to ssh into the affected machine and do: rmmod ohci_hcd modprobe ohci_hcd Then the system will be good from anywhere to a few hours to a week when this occurs again. I am running an up to date Centos 4.2 albeit with the 2.6.9-27 SMP kernel. Here are the devices on the USB: # cat /proc/bus/usb/devices T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 4 B: Alloc= 27/900 us ( 3%), #Int= 2, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.06 S: Manufacturer=Linux 2.6.9-27.ELsmp ohci_hcd S: Product=OHCI Host Controller S: SerialNumber=0000:02:00.0 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0 D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=046d ProdID=c002 Rev= 1.10 S: Manufacturer=Logitech S: Product=USB-PS/2 Mouse M-BA47 C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 50mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=051d ProdID=0002 Rev= 1.06 S: Manufacturer=American Power Conversion S: Product=Back-UPS RS 1000 FW:7.g4 .D USB FW:g4 S: SerialNumber=JB0317027749 C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 24mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid E: Ad=81(I) Atr=03(Int.) MxPS= 6 Ivl=10ms Does anyone have any ideas on what I might do to fix this problem. Thanks. -- Paul (ganci at nurdog.com)