On Sat, 2005-11-26 at 17:40 -0800, Mark Knecht wrote: > Changing interrupt priorities of internal devices on a laptop is not > possible. The devices are on the motherboard and are hard wired to > specific inputs on the PIC. You cannot change them at all. i am not sure that this is strictly true. my impression of modern intel- based architecture is that the inputs to the (A)PIC do not map deterministically to IRQ lines feeding the CPU. the (A)PIC and its cousins can be programmed to do many different things. the problem with laptops is generally that they come with a BIOS that offers no options to "reprogram" the (A)PIC, and then you boot into a kernel that generally seems to want to leave this stuff alone. this is increasingly the case on non-laptops as well, which is quite depressing. i wrote a little perl script sometime this year or last to dump the PIC routings. it was quite instructional :) --p
