Use i915 Kernel Patch on 12th Generation Intel® Core™ Processors for Optimal GPU Performance#

The current 5.15 IOT kernel delivered with Ubuntu 22.04 IOT is missing the latest patches to boost the GPU frequency. This affects the 12th Generation Intel® Core™ processors, where the GPU performance is significantly slower with the 5.15 kernel.

You can find details about these patches here: https://patchwork.freedesktop.org/series/96082/

Use this command to check the current kernel version of your target machine:

uname -r

Update the Kernel#

The latest linux-intel-iotg jammy kernel from canonical has already applied the patch. The sources for that kernel are located in this repository: https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-intel-iotg/+git/jammy/

This tutorial will allow you to update the kernel to the latest version.

Clone the Kernel Source.#

git clone https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-intel-iotg/+git/jammy
cd jammy

Build the Kernel#

  1. Copy your current kernel configuration and save it as .config in your (jammy) build folder.

    cp /boot/config-`uname -r` .config

  2. Trigger the kernel build

    make oldconfig    # You can normally just press enter till the end to take the default options
make -j$(nproc)
make modules_install -j$(nproc)
make install

Reboot the System and Check the Kernel Version#

To determine the new kernel version and ensure kernel version matches, run this command in the jammy folder after reboot:

make kernelversion

uname -r