If you bought the Lenovo Thinkbook 15 G2 ARE with the AMD processor you probably noticed that the suspend option is not working in Linux. After some debugging I finally found a work around. The problem was present even with the latest kernel on a Arch Linux system with Kernel 5.12.14. The issue was also present under Ubuntu, with a slightly older kernel.
This fix has been tested on the 14 and 15 inch with the AMD processor, under Arch and Ubuntu.
On a GRUB system
If your system uses GRUB, edit the
/etc/default/grub file. On the following line :
add the following :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=soft"
This part can vary a lot between distributions, apply the changes with the following:
grub2-mkconfig -o /boot/grub/grub.cfg
grub-mkconfig -o /boot/grub/grub.cfg
On a SYSTEMD-BOOT system
edit your config file /boot/esp/loader/entries/<your_config>.conf
Note: on PopOS! the file is called : /boot/efi/loader/entries/Pop_OS-current.conf
In your file you should see something similar as :
options root="LABEL=arch_os" rw
add the new option before the last double quote, like this:
options root="LABEL=arch_os" rw iommu=soft
Note: on PopOS! it will look like this, add the iommu=soft after ro.
options root=UUID=... ro iommu=soft quiet loglevel=0 systemd.show_status=false splash
Thanks to Man Son Ha for the details about PopOS!