Distribution: debian unstable
Hardware Environment: notebook ?
Software Environment: debian unstable
Problem Description: 
this notebook has a lot of strange behaviours when deals with irq assign:

$ cat /proc/interrupts
           CPU0
  0:    1197541          XT-PIC  timer
  1:       3459          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  3:          4          XT-PIC  yenta, uhci_hcd
  5:      39090          XT-PIC  uhci_hcd, VIA8233
  9:        230          XT-PIC  acpi
 10:          2          XT-PIC  ohci1394, ehci_hcd
 11:        108          XT-PIC  eth0, uhci_hcd
 12:     114801          XT-PIC  i8042
 14:       9945          XT-PIC  ide0
 15:       1062          XT-PIC  ide1
NMI:          0
LOC:    1195499
ERR:     267255
MIS:          0

at every boot it says:
pci_irq-0316 [19] acpi_pci_irq_derive   : Unable to derive IRQ for device
0000:00:11.1
ACPI: No IRQ known for interrupt pin A of device 0000:00:11.1
(device 0000:00:11.1 is the ide controller)

the system works and it never hangs, but the cdrom is unusable:
many it freezes the process try to access it  

sometimes it does not assign an irq to the yenta cardbus, and so the
pcmcia/cardbus don't work at all.

the behaviour is about the same under either the 2.4 and the 2.6.(.27-rc2)
kernels: the only difference is that under the 2.4 it never freezes the
processes and the cdrom drive.

so here's the dmesg.

i tried a lot of kernels parameters without results, but i don't have the
right clue to understand what's happens.