Had a look at kern.log after reading earlier post found:

Nov 22 22:20:01 sibs-laptop kernel: [    2.176614] Marking TSC unstable due to TSC halts in idle                                                                            
Nov 22 22:20:01 sibs-laptop kernel: [    2.176637] ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])                                                                          
Nov 22 22:20:01 sibs-laptop kernel: [    2.176673] processor LNXCPU:00: registered as cooling_device0                                                                       
Nov 22 22:20:01 sibs-laptop kernel: [    2.176678] ACPI: Processor [CPU0] (supports 8 throttling states)                                                                    
Nov 22 22:20:01 sibs-laptop kernel: [    2.177133] ACPI: SSDT 7f7b8300 000C8 (v01  PmRef  Cpu1Ist 00003000 INTL 20051117)                                                   
Nov 22 22:20:01 sibs-laptop kernel: [    2.177774] ACPI: SSDT 7f7b8620 00085 (v01  PmRef  Cpu1Cst 00003000 INTL 20051117)                                                   
Nov 22 22:20:01 sibs-laptop kernel: [    2.179187] ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])                                                                          
Nov 22 22:20:01 sibs-laptop kernel: [    2.179218] processor LNXCPU:01: registered as cooling_device1                                                                       
Nov 22 22:20:01 sibs-laptop kernel: [    2.179223] ACPI: Processor [CPU1] (supports 8 throttling states)                                                                    
Nov 22 22:20:01 sibs-laptop kernel: [    2.185768] ACPI Warning: \_TZ_.THRM._PSL: Return Package type mismatch at index 0 - found Processor, expected Reference 20090521 nspredef-946                                                                                                                                                                   
Nov 22 22:20:01 sibs-laptop kernel: [    2.185779] ACPI: Expecting a [Reference] package element, found type C                                                              
Nov 22 22:20:01 sibs-laptop kernel: [    2.185782] ACPI: Invalid passive threshold                                                                                          
Nov 22 22:20:01 sibs-laptop kernel: [    2.187887] thermal LNXTHERM:01: registered as thermal_zone0                                                                         
Nov 22 22:20:01 sibs-laptop kernel: [    2.187899] ACPI: Thermal Zone [THRM] (91 C)                                                                                         
Nov 22 22:20:01 sibs-laptop kernel: [    2.187975] isapnp: Scanning for PnP cards...
======================

Nov 22 22:25:12 sibs-laptop kernel: [  329.573161] CPU1: Temperature above threshold, cpu clock throttled (total events = 196)                                              
Nov 22 22:25:12 sibs-laptop kernel: [  329.574131] CPU1: Temperature/speed normal                                                                                           
Nov 22 22:27:02 sibs-laptop kernel: [  439.606851] Critical temperature reached (127 C), shutting down.                                                                     
Nov 22 22:27:02 sibs-laptop kernel: Kernel logging (proc) stopped.