I have an overheating and excessive fan noise problem with Ubuntu 11.10 on a brand new Toshiba Portege R830-13C laptop. The laptop is dual boot with Windows 7, where I don't have this problem at all, so I'm assuming it's an Ubuntu issue. Any ideas?
There is a known issue with the Active State Power Management (ASPM) in the kernel for Ubuntu 11.10 that effects some laptops - details in this Phoronix article .
You can edit your GRUB cofig file and add some parameters to try to solve the issue;
If pcie_aspm=force is set, hardware that does not support ASPM can cause the system to stop responding. Before setting pcie_aspm=force, ensure that all PCIe hardware on the system supports ASPM.