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dninja

Member

From: Sheffield, UK

Registered: 2006-04-29

Posts: 374

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Disabling IRQ #18 - error about USB when no USB devices in use

My laptop has started regularly giving the following error message in dmesg

irq 18: nobody cared (try booting with the "irqpoll" option)
Pid: 0, comm: swapper Tainted: P        2.6.24-ARCH #1
 [<c015c244>] __report_bad_irq+0x24/0x80
 [<c015c52b>] note_interrupt+0x28b/0x2d0
 [<c015b740>] handle_IRQ_event+0x30/0x60
 [<c015cc57>] handle_fasteoi_irq+0x87/0xe0
 [<c01083bb>] do_IRQ+0x3b/0x70
 [<c0105f47>] common_interrupt+0x23/0x28
 [<c012007b>] copy_vm86_regs_from_user+0xb/0x50
 [<f8a2e59f>] acpi_idle_enter_simple+0x15a/0x1c7 [processor]
 [<c02d1c4c>] cpuidle_idle_call+0x7c/0xb0
 [<c01036c3>] cpu_idle+0x73/0xe0
 =======================
handlers:
[<f89b1b60>] (usb_hcd_irq+0x0/0x60 [usbcore])
[<f89b1b60>] (usb_hcd_irq+0x0/0x60 [usbcore])
Disabling IRQ #18

and just the last line on screen.

I thought it was probably my wireless card as I'm doing some scripting with it but it is a cardbus card going into a pci express slot via a converter and the error message is about usbcore.

/proc/interrupts gives the following for IRQ 18:

 18:     788257     811744   IO-APIC-fasteoi   uhci_hcd:usb5, ehci_hcd:usb6

I have no USB devices plugged into the machine but if I do lsusb I get this:

Bus 007 Device 002: ID 0bda:8197 Realtek Semiconductor Corp. 
Bus 007 Device 001: ID 0000:0000  
Bus 006 Device 001: ID 0000:0000  
Bus 005 Device 001: ID 0000:0000  
Bus 004 Device 001: ID 0000:0000  
Bus 003 Device 001: ID 0000:0000  
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 001: ID 0000:0000

The Realtek reference is the built in wifi card which I'm not touching with the scripts, I haven't even got the kernel modules loaded for it.

Before I found this error message in dmesg I didn't have the "irqpoll" option on boot and this error usually made the system remount the drives as read only and give errors when trying to reboot either through shutdown or a ctrl-alt-del. Now I have the option the hdd is ok and the machine seems to stay running OK but I'd like to know what is going on. The machine is only about 6 months old and if there is a hardware fault then I want to get it back ASAP, especially as it is a Toshiba and they offer replacement and your cash back if a machine is faulty!

Can anyone suggest anything that it could be or anything I could try to diagnose it further?