Question

3

New inspiron is OverHeating on 20.04 LTS

rated 0 times [ 3] [ 0] / answers: 1 / hits: 389 / 2 Years ago, fri, april 15, 2022, 3:26:33

I bought a DELL Inspiron 5518 (16gb, 512gb + Nvidia MX450) this year. The laptop officially supports Ubuntu.
I dual booted the Windows with Ubuntu 20.04 but there is very high difference between usage.

On windows, it sustains upto 5-6 hours of usage with negligible heating on the upper keyboard side (where fans are)

But on ubuntu, it barely resists 1.5 hours and the upper right part of keyboard is so much heated that a finger can't be kept there for long.

I installed lmsensors and did sensors-detect.
It prompted only coretemp to add to /etc/modules and I did the same

There was no fan info when running sensors.

Important Update
Some observations I have made now

sensors show very normal temperature even when it is blazing hot. So, I thought maybe battery is hot. but acpitool shows temp unavailable.

The fans are running at high noise on ubuntu and silent on Windows.

tlp, thermald etc are not making any effect.

nvidia-settings is not available. When installed it is blank meaning nvidia is not detected. Settings show GPU is Intel Iris.
sudo prime-select query show on-demand. There was no effect when i changed it to nvidia hence I changed it to intel to be on safe side.

The system is up-to-date and also did sudo ubuntu-drivers autoinstall.

Attempt

I found out that the power settings can be corrected by imitating that it is a windows system in Grub by

in /etc/default/grub, I had

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

I experimented with

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=!Windows 2020"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=! acpi_osi='Windows 2020'"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=! "acpi_osi=Windows 2020" "

(P.S. this was the solution all along, see answer below)

but to no avail.

Any suggestion is welcome.

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scusaper

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answered 2 Years ago ateact · Accepted Answer

After tremendous research and experimenting, I found the solution to this problem.

The problem seems to be the compatibility between the Bios/Grub power-management and Ubuntu. For example, the ACPI DSDT expects some different OS and we are running some different OS.

Now as I mentioned in the question about experimenting with /etc/default/grub, I was actually missing a very important step and that was to check the version of Windows OSI that is actually supported by my device power management.

(It has to be Windows because the laptop performs excellent on Windows, hence our objective is to fake Ubuntu as Windwos to the device)

https://news.ycombinator.com/item?id=26747559

As mentioned in above article, the supported Window OSI can be found by

sudo strings /sys/firmware/acpi/tables/DSDT | grep -i 'windows ' | sort

Microsoft Windows NT

Windows 2001

Windows 2001

Windows 2001.1

Windows 2001 SP1

Windows 2001 SP2

Windows 2006

Windows 2006

Windows 2009

Windows 2009

Windows 2012

Windows 2012

Windows 2013

Windows 2013

Windows 2015

Windows 2015

So, now this was the final edit I made in the /etc/default/grub file.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=! "acpi_osi=Windows 2015" "

And by this, the overheating as well as battery issue is resolved.