I have the same problem on my Lenovo T500. I think the graphics card is
involved.
This laptop has "hybrid graphics" - one Intel GMA 4500MHD and one ATI
Mobility Radeon HD 3650. When I boot with the Intel card, I get "irq 16:
nobody cared" during boot, not when I boot with the ATI card.
And /proc/interrupts are surely different with the two cards. Look at
the irq 16 line:
$ cat intel-interrupts.txt
CPU0 CPU1
0: 23658 22859 IO-APIC-edge timer
1: 168 177 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 329 347 IO-APIC-fasteoi acpi
12: 3065 3166 IO-APIC-edge i8042
16: 49732 50269 IO-APIC-fasteoi yenta, uhci_hcd:usb6
17: 1 0 IO-APIC-fasteoi firewire_ohci, uhci_hcd:usb7
18: 0 0 IO-APIC-fasteoi mmc0, uhci_hcd:usb8
19: 216 204 IO-APIC-fasteoi ehci_hcd:usb2
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
21: 114 103 IO-APIC-fasteoi uhci_hcd:usb4
22: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
23: 9 9 IO-APIC-fasteoi i801_smbus, ehci_hcd:usb1
40: 0 0 DMAR_MSI-edge dmar2
41: 0 0 DMAR_MSI-edge dmar0
42: 0 0 DMAR_MSI-edge dmar3
43: 0 0 PCI-MSI-edge PCIe PME
44: 0 0 PCI-MSI-edge PCIe PME
45: 0 0 PCI-MSI-edge PCIe PME
46: 0 0 PCI-MSI-edge PCIe PME
47: 10023 10173 PCI-MSI-edge ahci
48: 10 8 PCI-MSI-edge mei
49: 22 30 PCI-MSI-edge eth0
50: 66 71 PCI-MSI-edge i915
51: 2508 2348 PCI-MSI-edge iwlwifi
52: 168 169 PCI-MSI-edge snd_hda_intel
NMI: 17 17 Non-maskable interrupts
LOC: 27988 25243 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 17 17 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 4584 2746 Rescheduling interrupts
CAL: 6178 7492 Function call interrupts
TLB: 702 651 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 1 1 Machine check polls
ERR: 0
MIS: 0
$ cat ati-interrupts.txt
CPU0 CPU1
0: 15488 15268 IO-APIC-edge timer
1: 182 189 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 328 339 IO-APIC-fasteoi acpi
12: 2071 1997 IO-APIC-edge i8042
16: 55 47 IO-APIC-fasteoi yenta, uhci_hcd:usb4
17: 1 1 IO-APIC-fasteoi firewire_ohci, uhci_hcd:usb5
18: 0 0 IO-APIC-fasteoi uhci_hcd:usb6, mmc0
19: 219 202 IO-APIC-fasteoi ehci_hcd:usb8
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb1
21: 112 104 IO-APIC-fasteoi uhci_hcd:usb2
22: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
23: 10 8 IO-APIC-fasteoi i801_smbus, ehci_hcd:usb7
40: 0 0 DMAR_MSI-edge dmar1
41: 0 0 DMAR_MSI-edge dmar0
42: 0 0 DMAR_MSI-edge dmar2
43: 0 0 PCI-MSI-edge PCIe PME
44: 0 0 PCI-MSI-edge PCIe PME
45: 0 0 PCI-MSI-edge PCIe PME
46: 0 0 PCI-MSI-edge PCIe PME
47: 0 0 PCI-MSI-edge PCIe PME
48: 9733 9932 PCI-MSI-edge ahci
49: 9 9 PCI-MSI-edge mei
50: 2308 2196 PCI-MSI-edge iwlwifi
51: 15 35 PCI-MSI-edge eth0
52: 818 815 PCI-MSI-edge radeon
53: 167 167 PCI-MSI-edge snd_hda_intel
NMI: 17 16 Non-maskable interrupts
LOC: 18139 34223 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 17 16 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 3788 3563 Rescheduling interrupts
CAL: 6303 5894 Function call interrupts
TLB: 711 711 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 1 1 Machine check polls
ERR: 0
MIS: 0
--
Hilsen Harald
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