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 :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
add the following :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=soft"
apply the changes with the following:
sudo grub-update
grub2-mkconfig -o /boot/grub/grub.cfg
reboot
On a SYSTEMD-BOOT system
edit your config file /boot/esp/loader/entries/<your_config>.conf
In your file you should see something similar as :
options root="LABEL=arch_os" rwadd the new option before the last double quote, like this:
options root="LABEL=arch_os" rw iommu=soft
Save the file and exit the editor
mkinitcpio -P reboot
Thanks for your help with this Luc.
On my Thinkbook 14 AMD G2, Suspend via OS now works great, thanks to your fix!
However, Suspend triggered by closing the lid was still a problem. (did not wake)
In my case I set HandleLidSwitch=ignore, then I could either manually suspend & close the lid or close the lid (screen blanks) & allow the system to self-suspend after 20 mins (or whatever the sys pref is)
In case this affects anyone else:
/etc/systemd/logind.conf
HandleLidSwitch=ignore
HandleLidSwitchExternalPower=ignore
if you permit, can I add this info to the post?
of course!
Thanks, this fixed resume on ThinkBook G2 14 ARE
thanks for the feedback!