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I have run into heating issues on my ultrabook running Linux. Idling temperature for Win7 is ~45 C, while in Linux it is ~55 C.

Output of sensors

rohit@raijin ~ $ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +52.0°C  (crit = +99.0°C)
temp2:        +29.8°C  (crit = +99.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +55.0°C  (high = +86.0°C, crit = +100.0°C)
Core 0:         +54.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:         +55.0°C  (high = +86.0°C, crit = +100.0°C)

Output of acpi

rohit@raijin ~ $ acpi -V
Battery 0: Full, 100%
Battery 0: design capacity 6100 mAh, last full capacity 6100 mAh = 100%
Adapter 0: on-line
Thermal 0: ok, 29.8 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 99.0 degrees C
Thermal 0: trip point 1 switches to mode passive at temperature 97.0 degrees C
Thermal 1: ok, 52.0 degrees C
Thermal 1: trip point 0 switches to mode critical at temperature 99.0 degrees C
Thermal 1: trip point 1 switches to mode active at temperature 71.0 degrees C
Thermal 1: trip point 2 switches to mode active at temperature 55.0 degrees C
Cooling 0: LCD 0 of 7
Cooling 1: Processor 0 of 10
Cooling 2: Processor 0 of 10
Cooling 3: Processor 0 of 10
Cooling 4: Processor 0 of 10
Cooling 5: Fan 1 of 1
Cooling 6: Fan 1 of 1
Cooling 7: Fan 1 of 1
Cooling 8: Fan 1 of 1
Cooling 9: Fan 0 of 1

Kernel

rohit@raijin ~ $ uname -a
Linux raijin 3.2.0-27-generic #43-Ubuntu SMP Fri Jul 6 14:25:57 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

As per this suggestion I modified the GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub to include

i915.i915_enable_rc6=7 i915.i915_enable_fbc=1 i915.lvds_downclock=1 drm.vblankoffdelay=1

It didn't help much.

What I want to know is how is Thermal 1: trip point 2, as show in the ACPI output, set? For that is where my CPU cores are settling on idle.

And how can I bring my cores to ~45 C at idle?

share|improve this question
    
I have the same laptop Samsung NP530 Intel i5 and it is also running at 56 degrees in idle I have tried everything no change in Windows 7 it is 50 degrees OpenSue 12.2 Kernel 3.6 –  user180486 Dec 15 '12 at 13:10
    
Can you verify that SpeedStep is working? See if the CPU frequency and voltage down-throttles at idle. –  Breakthrough Dec 15 '12 at 13:55
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protected by Community Dec 15 '12 at 13:39

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