Please get the output of "cat /proc/interrupts" from a fresh boot without the irqpoll, so we can see what devices are registered to IRQ 7.
I only see two things from lspci, and that's USB and a Bridge. Perhaps the bridge is somehow producing these interrupts. It may be worth checking if you have a BIOS update for this system. ** Changed in: linux-source-2.6.20 (Ubuntu) Status: Confirmed => Needs Info -- kernel later than 2.6.20-6 crash https://launchpad.net/bugs/90209 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs