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#1 2011-12-29 12:01:51

polylux
Member
Registered: 2011-12-27
Posts: 7

Laptop _still_ runs quite hot.

Hello everyone!

I've just bought a Samsung Chronos 7 (700Z5A). As usual, the first task was to install Arch Linux. Right after setup I noticed that the CPU fan was nearly constantly running. This is not only annoying but also drains the battery quite quickly.

Things I've done so far:
- CPU governor is "ondemand", setting the cpu to the lowest level during normal operation.
- CPU workload is minimal (0.1% - 2%)
- Played with 'powertop'
- acpi fully working
- The Intel Integrated Graphics are already forced to

pcie_aspm=force i915.i915_enable_rc6=1

which should reduce its power consumption and hence cool down the CPU
- Adding to the above, I've also played around with the i915's module settings:

options i915 modeset=1
options i915 i915_enable_rc6=1 
options i915 i915_enable_fbc=1 
options i915 lvds_downclock=1

'sensors' outputs this:

[ottona@neotokio ~]$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +62.0°C  (crit = +99.0°C)
temp2:        +29.8°C  (crit = +99.0°C)

radeon-pci-0100
Adapter: PCI adapter
temp1:       -128.0°C  

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +67.0°C  (high = +86.0°C, crit = +100.0°C)
Core 0:         +62.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:         +66.0°C  (high = +86.0°C, crit = +100.0°C)
Core 2:         +66.0°C  (high = +86.0°C, crit = +100.0°C)
Core 3:         +64.0°C  (high = +86.0°C, crit = +100.0°C)

[ottona@neotokio ~]$ 

...which is around 15 - 20°C above the levels I read on Windows.

Maybe someone knows another approach to the problem? Could also be that I'm too focused on the i915 that I miss out a very obvious fact that leads to the heating?

Thanks,
p.

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#2 2011-12-29 13:16:58

chmurli
Member
Registered: 2008-12-23
Posts: 51

Re: Laptop _still_ runs quite hot.

You have to disable dedicated video card.
https://bbs.archlinux.org/viewtopic.php … 6#p1029896

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#3 2011-12-29 17:51:38

polylux
Member
Registered: 2011-12-27
Posts: 7

Re: Laptop _still_ runs quite hot.

Well, based on this:

radeon-pci-0100
Adapter: PCI adapter
temp1:       -128.0°C 

I was assuming that the dGPU is disabled.

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#4 2011-12-29 19:16:59

/dev/zero
Member
From: Melbourne, Australia
Registered: 2011-10-20
Posts: 1,247

Re: Laptop _still_ runs quite hot.

polylux wrote:

- Played with 'powertop'

What does "played with" mean?

Do you have laptop-mode-tools installed?

polylux wrote:

- The Intel Integrated Graphics are already forced to

pcie_aspm=force i915.i915_enable_rc6=1

which should reduce its power consumption and hence cool down the CPU
- Adding to the above, I've also played around with the i915's module settings:

options i915 modeset=1
options i915 i915_enable_rc6=1 
options i915 i915_enable_fbc=1 
options i915 lvds_downclock=1

Maybe someone knows another approach to the problem? Could also be that I'm too focused on the i915 that I miss out a very obvious fact that leads to the heating?

Maybe, as you say, you're too focused on i915. Check the output of

lspci -mvknn | grep -B8 i915

The output will be non-empty if your system uses i915.

Assuming you do use i915, you may wish to compare your boot flags with the ones I use:

pcie_aspm=force acpi_osi=Linux acpi_backlight=vendor i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1

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#5 2012-01-06 17:20:13

cl
Member
Registered: 2010-07-22
Posts: 4

Re: Laptop _still_ runs quite hot.

Hi,

i have the same problems with my a Samsung Chronos 7 (14" Version 700Z3A ). My battery keeps up to 2 hours. This is less then the half on windows with over 5 hours.
Of course, i tried the well known tweaks as polylux already described.

- cpufrequtils, (cpupower), laptop mode tools
- i915 options
- disable dGPU
- powertop2


 
$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +63.0°C  (crit = +99.0°C)
temp2:        +29.8°C  (crit = +99.0°C)

radeon-pci-0100
Adapter: PCI adapter
temp1:       -128.0°C 

Are there any users with less power consumption on  Samsung chronos laptops?

Thanks.

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