---
layout: default
title: Cooling down ThinkPad P1 gen 5
date: 2023-11-17 21:58 +0100
tags: ThinkPad
---
P1 heats up considerably, even when running on battery. This makes it unpleasant
to hold on your lap, puts stress on NVME drives, and even causes the keyboard
keys to get hot.

h2. Power off discrete GPU.

* "Hybrid graphics - Archlinux wiki":https://wiki.archlinux.org/title/Hybrid_graphics#Fully_Power_Down_Discrete_GPU
* "optimus-switch - Github":https://github.com/dglt1/optimus-switch
* "Intel - Gentoo wiki":https://wiki.gentoo.org/wiki/Intel
* "Intel graphics - Archlinux wiki":https://wiki.archlinux.org/title/intel_graphics

It's impossible to turn off Nvidia GPU through BIOS. Energy consumption of
discrete GPU can be monitored with:

{% highlight bash %}
nvidia-smi
{% endhighlight %}

In reality the above value (4W on battery, 5W on AC in desktop environment) seems to be
underestimation. Powering off the dGPU using steps below changes energy
consumption reported by @powertop@ from *24W before* to *16W after* on battery.

# Make sure kernel driver for Intel GPU is compiled (@DRM_I915@).

#_ Remove _/etc/modprobe.d/nvidia.conf_ if present.

#_ Blacklist @nvidia@ kernel modules and configure @i915@ appropriately.

{% highlight file caption=/etc/modprobe.d/intel.conf %}
blacklist nouveau
blacklist ttm
install nvidia /bin/false
install nvidia-modeset /bin/false
install nvidia-peermem /bin/false
install nvidia-drm /bin/false
install nvidia-uvm /bin/false

# Stops display from "blinking" or "flashing"
# during boot when using the intel driver.
options i915 enable_fbc=1
options i915 fastboot=1
{% endhighlight %}

#_ Configure _xorg_ to use Intel device with @modesetting@ driver
(@xf86-video-intel@ is outdated and does not suppot hardwware acceleration on
newer GPU models). Use @lspci@ to find bus ID of Intel GPU.

{% highlight file caption=/etc/X11/xorg.conf.d/20intel.conf %}
Section "Device"
  Identifier "Intel Graphics"
  Driver "modesetting"
  BusID "PCI:0:2:0"
  #Option "AccelMethod" "glamor" # default
  #Option "TearFree" "true"
EndSection
{% endhighlight %}

#_ Power off Nvidia PCI device on every boot using _udev_ rules.

{% highlight file caption=/etc/udev/rules.d/00-nvidia-remove.rules %}
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{power/control}="auto", ATTR{remove}="1"

# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{power/control}="auto", ATTR{remove}="1"

# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{power/control}="auto", ATTR{remove}="1"

# Remove NVIDIA VGA/3D controller devices
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{power/control}="auto", ATTR{remove}="1"
{% endhighlight %}

#_ Regenerate _initramfs_ and reboot.

{% highlight bash %}
genkernel initramfs
reboot
{% endhighlight %}


h2. Limit CPU/platform/integrated GPU energy usage with @tlp@

Active seetings can be verified using:
* @tlp-stat -p@ for CPU and platform,
* @tlp-stat -g@ for GPU