When I plug in the AC cable the fan's become loud

Question

Hey,
I reinstalled Arch again and I followed the Beginner's Guide. I installed laptop-mode-tools and cpupower, pm-utils etc. and followed the configuration instructions. But my laptop is really loud when I plug-in AC. I read that LMT etc. are not really needed anymore. But how to get my system quiet then? I have a Samsung Ultrabook NP530U3c.
In the previous installation I could also change my CPU-speed via the FN-keys which is also not possible anymore. The CPU frequency applet tells me that frequency scaling is not available. I don't know what could be missing... When I look at the output of the i7z tool, I can see that my system runs most of time with one core at almost 100% and the others running pretty low. I can't imagine that the processor is supposed to behave like that!
Greetings
Last edited by gunjah292 (2014-12-18 10:07:46)

Answer 1

I think it is related to lm_sensors. When I run sensors-detect it only finds the sensor for the CPU.
# sensors-detect revision 6209 (2014-01-14 22:51:58 +0100)
# System: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C/532U3C [0.1] (laptop)
# Board: SAMSUNG ELECTRONICS CO., LTD. NP530U3C-A0DDE
This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.
Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no):
Module cpuid loaded successfully.
Silicon Integrated Systems SIS5595... No
VIA VT82C686 Integrated Sensors... No
VIA VT8231 Integrated Sensors... No
AMD K8 thermal sensors... No
AMD Family 10h thermal sensors... No
AMD Family 11h thermal sensors... No
AMD Family 12h and 14h thermal sensors... No
AMD Family 15h thermal sensors... No
AMD Family 15h power sensors... No
AMD Family 16h power sensors... No
Intel digital thermal sensor... Success!
(driver `coretemp')
Intel AMB FB-DIMM thermal sensor... No
VIA C7 thermal sensor... No
VIA Nano thermal sensor... No
Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.
Do you want to scan for Super I/O sensors? (YES/no):
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'... No
Trying family `SMSC'... No
Trying family `VIA/Winbond/Nuvoton/Fintek'... No
Trying family `ITE'... No
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor/ITE'... No
Trying family `SMSC'... No
Trying family `VIA/Winbond/Nuvoton/Fintek'... No
Trying family `ITE'... No
Some hardware monitoring chips are accessible through the ISA I/O ports.
We have to write to arbitrary I/O ports to probe them. This is usually
safe though. Yes, you do have ISA I/O ports even if you do not have any
ISA slots! Do you want to scan the ISA I/O ports? (YES/no):
Probing for `National Semiconductor LM78' at 0x290... No
Probing for `National Semiconductor LM79' at 0x290... No
Probing for `Winbond W83781D' at 0x290... No
Probing for `Winbond W83782D' at 0x290... No
Lastly, we can probe the I2C/SMBus adapters for connected hardware
monitoring devices. This is the most risky part, and while it works
reasonably well on most systems, it has been reported to cause trouble
on some systems.
Do you want to probe the I2C/SMBus adapters now? (YES/no):
Using driver `i2c-i801' for device 0000:00:1f.3: Intel Panther Point (PCH)
Module i2c-dev loaded successfully.
Next adapter: i915 gmbus ssc (i2c-0)
Do you want to scan it? (yes/NO/selectively): Y
Next adapter: i915 gmbus vga (i2c-1)
Do you want to scan it? (yes/NO/selectively): Yes
Next adapter: i915 gmbus panel (i2c-2)
Do you want to scan it? (yes/NO/selectively): yes
Next adapter: i915 gmbus dpc (i2c-3)
Do you want to scan it? (yes/NO/selectively): yes
y
Next adapter: i915 gmbus dpb (i2c-4)
Do you want to scan it? (yes/NO/selectively): yes
Next adapter: i915 gmbus dpd (i2c-5)
Do you want to scan it? (yes/NO/selectively): yes
Next adapter: DPDDC-B (i2c-6)
Do you want to scan it? (yes/NO/selectively): yes
Now follows a summary of the probes I have just done.
Just press ENTER to continue:
Driver `coretemp':
* Chip `Intel digital thermal sensor' (confidence: 9)
Do you want to overwrite /etc/conf.d/lm_sensors? (YES/no): yes
Unloading i2c-dev... OK
Unloading cpuid... OK