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Description of problem:
This is a longstanding problem on Fujitsu P2120 notebooks, first reported by myself here: http://bugme.osdl.org/show_bug.cgi?id=1322.
The IRQ assignment done by ACPI is not correct if the Ethernet interface is disabled on startup (running on battery mode). Prior to kernel 2.6.14, attempting to attach a USB device would result in a kernel hard-lock (need to remove power to recover). However, on 2.6.14, it gives an unhandled Interrupt driver crash debug information in dmesg, so perhaps some attempt to resolve this is possible.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Startup P2120 in battery-only mode (disables Ethernet device)
2. Check interrupt assignment for USB OHCI driver (invalid assignment to IRQ10)
3. Plug in USB device
Actual Results: dmesg output indicate kernel module crashed
Expected Results: Kernel USB driver module shouldn't crash
Driver should attempt to reset IRQ assignment (?)
Currently I boot with acpi_irq_isa=10,11 to force kernel to skip IRQ 10 for automatic assignment to USB OHCI driver.
Created attachment 121011 [details]
Default IRQ assignment when booting without 'acpi_irq_isa=10,11'
IRQ 10 should never be assigned to USB OHCI devices, EHCI and OHCI devices
(except one placed on IRQ11) should be placed on IRQ9. This problem does not
occur if Ethernet device is enabled and activated.
Created attachment 121012 [details]
Interrupt assignment for correct behavior
this is something that really needs to be worked out upstream. Otherwise we'll
end up carrying a zillion patches to workaround broken bioses. Either put up
with the boot command line, or try again to convince the upstream ACPI
maintainer that its necessary.