Barteq, ..just to add, here are the deltas of IRQ's on your system from
the last set of /proc/interrupts capture from your data.. showing a
worryingly high IRQ 0 hit.

              CPU0       CPU1
  0:      23573      23612   IO-APIC-edge      timer
  1:          558          562   IO-APIC-edge      i8042
  8:              0             0    IO-APIC-edge      rtc
  9:            94           95    IO-APIC-fasteoi   acpi
 12:             0             0    IO-APIC-edge      i8042
 14:             0             0    IO-APIC-edge      libata
 15:             0             0    IO-APIC-edge      libata
 16:             0             0    IO-APIC-fasteoi   uhci_hcd:usb3
 17:             0             0    IO-APIC-fasteoi   uhci_hcd:usb1
 18:             0             0    IO-APIC-fasteoi   uhci_hcd:usb2
 19:             0             0    IO-APIC-fasteoi   ehci_hcd:usb6
 22:             0             0    IO-APIC-fasteoi   uhci_hcd:usb5
 23:             0             2    IO-APIC-fasteoi   ehci_hcd:usb7
217:      2090       2047    PCI-MSI-edge      ahci
NMI:             0            0     Non-maskable interrupts
LOC:    13271     12598    Local timer interrupts
RES:    12201     11276    Rescheduling interrupts
CAL:           14            6   function call interrupts
TLB:           65           61   TLB shootdowns
TRM:            0             0   Thermal event interrupts
SPU:            0             0   Spurious interrupts
ERR:            0
MIS:             0

and lspci shows that the following devices share IRQ 0:

00:01.0 PCI bridge [0604]: Intel Corporation Mobile PM965/GM965/GL960 PCI 
Express Root Port [8086:2a01] (rev 0c) (prog-if 00 [Normal decode])
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller [8086:284b] (rev 03)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express 
Port 1 [8086:283f] (rev 03) (prog-if 00 [Normal decode])
00:1c.1 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express 
Port 2 [8086:2841] (rev 03) (prog-if 00 [Normal decode])
00:1c.2 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express 
Port 3 [8086:2843] (rev 03) (prog-if 00 [Normal decode])
00:1c.3 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express 
Port 4 [8086:2845] (rev 03) (prog-if 00 [Normal decode])
00:1c.4 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express 
Port 5 [8086:2847] (rev 03) (prog-if 00 [Normal decode])
01:00.0 VGA compatible controller [0300]: nVidia Corporation Quadro NVS 140M 
[10de:0429] (rev a1) (prog-if 00 [VGA controller])
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 4965 AG or 
AGN Network Connection [8086:4230] (rev 61)

..one of this may be the culprit.  But first I'd like to see of
acpi=noirq helps first.

Thanks, Colin.

-- 
Kernel 2.6.24-2 causing ~1000 wakeups by "Rescheduling Interrupts"
https://bugs.launchpad.net/bugs/177895
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