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06-19-2018

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T480 - CPU temperature and fan speed under linux

2018-06-19, 20:14 PM

Hi All,

Since a few days I am using T480 with Kubuntu 18.04.

When I use the laptop for web browsing and text edition (light use which should not consume too much resources), the CPU's temperature is always around 50 deg C, with the fan speed of around 3000 RPM (the average CPU usage is 6%). The MX150 GPU is disabled with NVIDIA X Server Settings. If the GPU is on, the temperature and fans speed is more or less the same.

 

Has anyone experienced similar CPU's temperatures regardless if it is windows or linux? Are such temperatures normal? The housing is pretty warm all the time.

The ambient temperature is around 24 deg C.

 

Best regards,

Lendzian

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6275 Posts

10-29-2009

NC

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Re: T480 - CPU temperature and fan speed under linux

2018-06-21, 16:56 PM

For linux, you need to change a BIOS setting.  Reboot and press F1 to enter BIOS setup.  In Config -> Thunderbolt menu, set "Thunderbolt BIOS Assist Mode" to "Enabled".  Then press F10 to save and exit.

0 person found this solution to be helpful.

This helped me too

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3 Posts

06-19-2018

PL

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Re: T480 - CPU temperature and fan speed under linux

2018-06-21, 22:20 PM

Thanks someotherguy for the help - it worked a bit, but I don't understand why :)

Here some magick is happening after enabling this BIOS Assist Mode - the fan runs quite rarely, what makes the computer more pleasant to use in terms of noise. When the fan is silent, the CPU's temperature slowly increases to around 60 deg, what also affects the heat in the housing, and then the fan successively cools the CPU a bit and stops again - this is good.

Whatsurprises me is the fact, that the battery discharge rate is decreased from 15 W to 11 W after enabling the mode, which is contrary to the statement in this manual,  that the power consumption will be higher.

Slighty better battery discharge rate gives me a bit more precious minutes of battery life (which in my case unfortunately is still far from being "epic")

 

So again - thank you.

 

Would you have any clues that could help to decrease the battery discharge rate? The whole internet says that it is due to the fact, the GPU, instead of Intel's integrated graphics, is working continuously instead of occasionally.

 

And finally are the temperatures of 50 deg - 60 deg normal for T480 with MX150?

Best regards.

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Re: T480 - CPU temperature and fan speed under linux

2018-06-21, 22:48 PM

The manual is a bit confusing, and this situation is a bit complicated.  First, some background information.  Windows 10 1709 (and later) supports thunderbolt natively in the OS, so BIOS just needs to stay out of the way.  This is what BIOS Assist Mode = Disabled does.  This is the default setting since we ship Win10 1709 (or later) on these machines.

 

Windows 10 earlier than 1709, and most linux distributions as of today, don't support thunderbolt natively, so then BIOS has to do some of the work.  This is what BIOS Assist Mode = Enabled does.

 

The statement about increased power consumption refers to what happens if you set this Enabled but your OS actually supports thunderbolt native mode.  And similarly, if you set this to Disabled but your OS does not support thunderbolt native mode (which was your case).  So this BIOS setting has to match the capability of the OS, or else you end up wasting battery and making heat.

 

As for your other questions - I really have no idea.  It could be the linux driver for MX150 is not optimized, or there could be some background process that is eating CPU/GPU cycles and making heat.  I'm not a linux user, so I personally won't be able to help, but I suspect if you post in a linux forum you might get some ideas.  50-60° C at idle seems high to me so I think there must be something going on in the background.

 

 

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06-19-2018

PL

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Re: T480 - CPU temperature and fan speed under linux

2018-06-22, 4:25 AM

Ok, thank you.
Now I understand how it works and I'll try to explore the issue of linux's background processes, which unnecessarily heat up the CPU.

Best regards.

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2 Posts

10-16-2018

CA

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Re: T480 - CPU temperature and fan speed under linux

2018-11-05, 19:32 PM

If you install nvidia proprietary drivers without properly blacklisting nouveau, sometimes nouveau will load and power up the dGPU. You can do this in a way that sticks between updates by editing /etc/default/grub to add

modprobe.blacklist=nvidia

to your kernel command line. This reduced my idle power from ~11w to ~5w.

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2 Posts

06-04-2019

IT

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Re: T480 - CPU temperature and fan speed under linux

2019-06-04, 15:30 PM

Hi Lendzian, i'm having the same problem since i'm using linux mint. Did you find out the reason for such unnecessarily heating?

I appreciate any suggestion

 

Best regards

 

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7978 Posts

01-13-2008

US

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Re: T480 - CPU temperature and fan speed under linux

2019-06-04, 15:16 PM

The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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