I have a Toshiba Satellite L300 Dual-Core laptop. Due to some problem i need to disable one core. How to do this in Ubuntu ( I have Ubuntu 12.10 ) ?
To do it dynamically, try (as root):
(or cpu0 to disable the first core)
To disable one core during boot use maxcpus=1 kernel parameter.
Alternatively, poke around your BIOS, maybe an option in there.