Chris Ridd wrote: > > > > Here's the output of "intrstat 5". Steady state is around the 20000 > mark, and dragging a big Thunderbird window around (causing a lot of > gnome-terminal windows to white out and not redraw themselves > immediately) increases it to around 24000. nvidia#0, uhci#0 and uhci#3 are sharing a legacy interrupt so each driver's interrupt handler is being called each time the interrupt goes off. A 20K number is usually an indication the interrupt is stuck on and is only being limited by how fast the CPU assigned to it (cpu3) can process them.
When you originally reported this it was happening on two systems: a desktop box sith NVIDIA Quadro FX 540 and a laptop with ATI FireGL 9000. Do you see the same interrupt issue on the notebook? If the SBIOS allows it can you selectively shut off each of your USB controllers to isolate which one is the source of the interrupts?
