My Lenovo T61 occasionally goes crazy with interrupts under kernels >=
2.6.28. powertop shows the situation clearly:
Top causes for wakeups:
99.4% (64644.0) <interrupt> : ahci, uhci_hcd:usb5, yenta,
i915@pci:0000:00:02.0
How does one tell which device is causing all these interrupts?