IRQ assignment on my IBM X24

[ron minnich]

this seems really poor bios design:
@mini rminnich]#  lspci -v -v | grep Interrupt
        Interrupt: pin A routed to IRQ 11
        Interrupt: pin B routed to IRQ 11
        Interrupt: pin C routed to IRQ 11
        Interrupt: pin A routed to IRQ 11
        Interrupt: pin B routed to IRQ 11
        Interrupt: pin B routed to IRQ 11
        Interrupt: pin B routed to IRQ 11
        Interrupt: pin A routed to IRQ 11
        Interrupt: pin A routed to IRQ 11
        Interrupt: pin B routed to IRQ 11
        Interrupt: pin A routed to IRQ 11
        Interrupt: pin A routed to IRQ 11

Pretty much everyone goes to IRQ 11.

And a bunch of Interrupts go unused:

           CPU0       
  0:    3381694          XT-PIC  timer
  1:      13873          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  8:          1          XT-PIC  rtc
 11:      77842          XT-PIC  usb-uhci, usb-uhci, usb-uhci, eth0, 
wlan0, Ricoh Co Ltd RL5c476 II, Ricoh Co Ltd RL5c476 II (#2)
 12:     360259          XT-PIC  PS/2 Mouse
 14:      85559          XT-PIC  ide0
NMI:          0 
ERR:          0


Is there any reason a BIOS would do this?

ron