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_posts/sysadm/2023-11-17-cooling-down-thinkpad-p1-gen-5.tl

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+---
+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+(@xf86-video-intel@ is outdated and does not suppot hardwware acceleration on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