On a Fujitsu-Siemens Celsius Mobile H, modprobe usb-uhci hangs the system. The USB controllers are, according to lspci 00:1d.0 Class 0c03: 8086:2482 (rev 01) Subsystem: 110a:0082 Flags: bus master, medium devsel, latency 0, IRQ 10 I/O ports at 1800 [size=32] 00:1d.1 Class 0c03: 8086:2484 (rev 01) Subsystem: 110a:0082 Flags: bus master, medium devsel, latency 0, IRQ 10 I/O ports at 1820 [size=32] 00:1d.2 Class 0c03: 8086:2487 (rev 01) Subsystem: 110a:0082 Flags: bus master, medium devsel, latency 0, IRQ 5 I/O ports at 1840 [size=32] (This is the same box that hangs on "cat /proc/apm", and they want us to certify this crap. Yuck... ;) )
Are interrupts still enabled? Can you do alt-sysrq-*? What about nmi_watchdog=1?
Well they can always get us a fixed BIOS for the APM - its probably something daft. I have a detailed BIOS document for the kernel available we can send to their BIOS people. The other one does look like an IRQ routing bug/storm. Again maybe an incorrect BIOS table.
Can't give any feedback on the status, we don't have the test box anymore.