Got a linux mint 12 (32bitS) on a t61p intel core2duo, 6 gb ram, ssd. Issue arises with stock kernel and 3.2.0-12-generic-pae.
I got loads of timer interrupts, which even make my mouse moves not to be smooth anymore. sys cpu time up to 30-40%. Here is a snap of procinfo.
irq 0: 6669890 timer irq 21: 0 uhci_hcd:usb4
irq 1: 7678 i8042 irq 22: 114714 ehci_hcd:usb1
Reasearch led me to think that this is an autosuspend kworker thread.
I have tried to:
- disable USB in BIOS altogether -> still there?!?!
- for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 0 > $i; done
- echo on into power/control to deactive autosuspend
- echo -1 /sys/module/usbcore/parameters/autosuspend