hi kernel Volks,

2.6.7 runs into problems while setting up usb stuff and disables IRQ#3,
(at least, for me) see kern.log:

 kernel: tg3.c:v3.6 (June 12, 2004)
 kernel: PCI: Found IRQ 3 for device 0000:05:02.0
 kernel: eth0: Tigon3 [partno(BCM95782A50) rev 3003 PHY(5705)]
 (PCI:33MHz:32-bit) 10/100/1000BaseT Ethernet 00:40:ca:68:64:0d
 kernel: eth0: HostTXDS[1] RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] Split[0] WireSpeed[0] TSOcap[1]
	[..]
 kernel: PCI: Found IRQ 3 for device 0000:00:1d.7
 kernel: ehci_hcd 0000:00:1d.7: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller
 kernel: PCI: Setting latency timer of device 0000:00:1d.7 to 64
 kernel: ehci_hcd 0000:00:1d.7: irq 3, pci mem e0097000
 kernel: ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
 kernel: irq 3: nobody cared!
 kernel:  [__report_bad_irq+42/139] __report_bad_irq+0x2a/0x8b
 kernel:  [note_interrupt+111/159] note_interrupt+0x6f/0x9f
 kernel:  [do_IRQ+295/310] do_IRQ+0x127/0x136
 kernel:  [common_interrupt+24/32] common_interrupt+0x18/0x20
 kernel:  [__do_softirq+47/128] __do_softirq+0x2f/0x80
 kernel:  [do_softirq+38/40] do_softirq+0x26/0x28
 kernel:  [do_IRQ+259/310] do_IRQ+0x103/0x136
 kernel:  [common_interrupt+24/32] common_interrupt+0x18/0x20
 kernel:  [ehci_start+700/854] ehci_start+0x2bc/0x356
 kernel:  [printk+272/362] printk+0x110/0x16a
 kernel:  [usb_register_bus+311/346] usb_register_bus+0x137/0x15a
 kernel:  [usb_hcd_pci_probe+685/1248] usb_hcd_pci_probe+0x2ad/0x4e0
 kernel:  [do_coredump+78/484] do_coredump+0x4e/0x1e4
 kernel:  [pci_device_probe_static+82/97] pci_device_probe_static+0x52/0x61
 kernel:  [__pci_device_probe+59/78] __pci_device_probe+0x3b/0x4e
 kernel:  [pci_device_probe+44/74] pci_device_probe+0x2c/0x4a
 kernel:  [bus_match+63/106] bus_match+0x3f/0x6a
 kernel:  [driver_attach+86/128] driver_attach+0x56/0x80
 kernel:  [bus_add_driver+145/163] bus_add_driver+0x91/0xa3
 kernel:  [driver_register+47/51] driver_register+0x2f/0x33
 kernel:  [register_sysctl_table+104/143] register_sysctl_table+0x68/0x8f
 kernel:  [pci_register_driver+92/132] pci_register_driver+0x5c/0x84
 kernel:  [init+35/48] init+0x23/0x30
 kernel:  [do_initcalls+39/179] do_initcalls+0x27/0xb3
 kernel:  [init_workqueues+23/48] init_workqueues+0x17/0x30
 kernel:  [init+0/339] init+0x0/0x153
 kernel:  [init+56/339] init+0x38/0x153
 kernel:  [kernel_thread_helper+0/11] kernel_thread_helper+0x0/0xb
 kernel:  [kernel_thread_helper+5/11] kernel_thread_helper+0x5/0xb
 kernel:
 kernel: handlers:
 kernel: [usb_hcd_irq+0/103] (usb_hcd_irq+0x0/0x67)
 kernel: Disabling IRQ #3

using 2.6.6, it works, /proc/interrupts shows:

 	    CPU0       
   0:   10248130          XT-PIC  timer
   2:          0          XT-PIC  cascade
   3:     147782          XT-PIC  ehci_hcd, eth0
   5:     213155          XT-PIC  uhci_hcd
  10:          0          XT-PIC  uhci_hcd, Intel ICH5
  11:          0          XT-PIC  libata, uhci_hcd
  14:      15207          XT-PIC  ide0
 NMI:          0 
 ERR:          0

for more information regarding the system and its hardware, see 
attached lspci output. Both, 2.6.6 and 2.6.7 are using the same
configuration, hope this helps.

bye,
    - michael