Public bug reported:
$ dmesg | tail -15 | cut -c19-
irq 4: nobody cared (try booting with the "irqpoll" option)
<c0139ed4> __report_bad_irq+0x24/0x80 <c0139fcf> note_interrupt+0x9f/0x1f0
<c0139993> handle_IRQ_event+0x33/0x60 <c0139a75> __do_IRQ+0xb5/0xc0
<c01056f9> do_IRQ+0x19/0x30 <c0103e8a> common_interrupt+0x1a/0x20
<c02221a2> serial8250_startup+0x152/0x440 <c021df28> uart_startup+0x48/0x130
<c021ed0f> uart_open+0xbf/0x410 <c01594cd> get_empty_filp+0x5d/0x110
<c020de51> tty_open+0x161/0x310 <c016084e> chrdev_open+0x6e/0x140
<c01607e0> chrdev_open+0x0/0x140 <c0156674> __dentry_open+0xb4/0x1e0
<c0156855> nameidata_to_filp+0x35/0x40 <c01568b0> do_filp_open+0x50/0x60
<c0115d10> default_wake_function+0x0/0x10 <c0156555> get_unused_fd+0x45/0xb0
<c015690a> do_sys_open+0x4a/0xe0 <c01569dc> sys_open+0x1c/0x20
<c0102dbb> sysenter_past_esp+0x54/0x79
handlers:
[<c0222520>] (serial8250_interrupt+0x0/0xf0)
Disabling IRQ #4
$ grep ' 4:' /proc/interrupts
4: 200074 IO-APIC-edge serial
$ sudo setserial -g /dev/ttyS0
/dev/ttyS0, UART: undefined, Port: 0x03f8, IRQ: 4
This laptop (ThinkPad R52) does not have a physical serial port (there
is IRDA) on the main body, although there could be one wired for the
docking bay.
I've seen this issue once before.
** Affects: linux-source-2.6.17 (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
Disabling IRQ #4 (serial related)
https://launchpad.net/bugs/70002
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