Apologies for the late reply.

You can manually install recent kernels through apt, to list available kernels 
run:
apt-cache search linux-image | grep generic

To install a kernel you'll need to install the linux-image-* and the 
corresponding linux-modules-* package. For example:
sudo apt install linux-image-7.0.0-31-generic linux-modules-7.0.0-31-generic 

When you boot grub will give you the option of which kernel you want to use. 
You can always check which kernel you're running with:
uname -r

Testing older versions of linux-firmware is more difficult, as recent versions 
aren't kept in the package repositories. To find all the linux-firmware 
releases go here: https://launchpad.net/ubuntu/+source/linux-firmware and then 
click on your series, then under 'binary packages' select your architecture, 
then click on the version you want to try on the left, and then you can 
download the .deb file, which you can install with apt:
sudo apt install <deb_name>.deb

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https://bugs.launchpad.net/bugs/2169388

Title:
  ThinkBook 16 G8 IAL (21SK): s2idle suspend/resume loop after lid
  close, wake IRQ 9 (ACPI GPE 0x6D), ~20%/h battery drain

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