Acer Notebook: acpi IRQ stuck after S3

log and backtrace:

12:49:00 samt kernel: PM: Preparing system for suspend 12:49:00 samt kernel: Stopping tasks:
=======================================| 12:49:00 samt kernel: PM: Entering state. 12:49:00 samt kernel: Back to C!
12:49:00 samt kernel: irq 9: nobody cared!

12:49:00 samt kernel:  [<c010724a>] __report_bad_irq+0x2a/0x90
12:49:00 samt kernel:  [<c0107340>] note_interrupt+0x70/0xb0
12:49:00 samt kernel:  [<c01075f0>] do_IRQ+0x120/0x130
12:49:00 samt kernel:  [<c01053c8>] common_interrupt+0x18/0x20
12:49:00 samt kernel:  [<c013007b>] unqueue_me+0x3b/0xb0
12:49:00 samt kernel:  [<c012046e>] __do_softirq+0x2e/0x90
12:49:00 samt kernel:  [<c01204f7>] do_softirq+0x27/0x30
12:49:00 samt kernel:  [<c01075ca>] do_IRQ+0xfa/0x130
12:49:00 samt kernel:  [<c01053c8>] common_interrupt+0x18/0x20
12:49:00 samt kernel:  [<c0134ca8>] suspend_enter+0x38/0x50
12:49:00 samt kernel:  [<c0134d84>] enter_state+0x64/0xb0
12:49:00 samt kernel:  [<c02020c9>] acpi_suspend+0x3e/0x4d
12:49:00 samt kernel:  [<c0202478>] acpi_system_write_sleep+0x60/0x8b
12:49:00 samt kernel:  [<c020248d>] acpi_system_write_sleep+0x75/0x8b
12:49:00 samt kernel:  [<c0155a68>] vfs_write+0xb8/0x130
12:49:00 samt kernel:  [<c0154f99>] filp_close+0x59/0x90

12:49:00 samt cardmgr[1467]: executing: './network suspend eth1' 12:49:00 samt kernel: [<c0155bb1>] sys_write+0x51/0x80 12:49:00 samt kernel: [<c010525b>] syscall_call+0x7/0xb 12:49:00 samt kernel: handlers:
12:49:00 samt kernel: [<c01eb827>] (acpi_irq+0x0/0x16) 12:49:00 samt kernel: Disabling IRQ #9
12:49:00 samt kernel: PM: Finishing up.

As you can see, IRQ 9 gets stuck here and consequently, the next ACPI event (e.g. lid button) causes a system freeze. Hoping that the problem might relate to some uninitialized memory after resume I raised the limit for unhandled IRQs in spurious.c (irq.c before 2.6.10). But that does not help.
I'd really like to debug this but I need help from an expert where to look at to find out what happens to this acpi IRQ.

Thanks,
Fionn

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