Toshiba Satellite C640 overheating problem and shutdown

edit

Hi, I am having an overheating problem on Toshiba Satellite C640. The problem is more acute after upgrading the kernel to kernel-PAE-3.6.10-2.fc17.i686.

This happens even when there are minimal applications running.

sensors output
acpitz-virtual-0
Adapter: Virtual device
temp1:        +74.0°C  (crit = +110.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +67.0°C  (high = +80.0°C, crit = +90.0°C)
Core 2:       +72.0°C  (high = +80.0°C, crit = +90.0°C)

If i start with kernel-PAE-3.6.7-4.fc17.i686 the overheating is comparatively less.

The load is also low:

top - 16:25:47 up  1:04,  3 users,  load average: 0.51, 0.87, 1.08
Tasks: 194 total,   1 running, 193 sleeping,   0 stopped,   0 zombie
Cpu(s):  5.1%us,  1.7%sy,  0.0%ni, 92.0%id,  0.7%wa,  0.3%hi,  0.2%si,  0.0%st
Mem:   3926588k total,  3657880k used,   268708k free,   188492k buffers
Swap:  3866620k total,        0k used,  3866620k free,  1996652k cached

lspci output:
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
01:00.0 Ethernet controller: Atheros Communications AR8152 v2.0 Fast Ethernet (rev c1)
02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
3f:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02)
3f:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02)
3f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
3f:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02)
3f:02.2 Host bridge ...