I too am facing same issue with Asus expertcenter PN53.
I tried to check if the suspend issue is present in my installation or even live disk has the same.
It appears the issue is persistent across both.
Later I tried using ubuntu booted to tty2 without gdm3. suspend resume works perfectly fine. I tried exercising this cycle over 20 times, none failed. After this I logged into gdm3 from tty1 and tried running same command `sudo systemctl suspend` and it failed in first go.
with journalctl -b-1 the last log i see is `kernel: PM: suspend entry (s2idle)`
I too am facing same issue with Asus expertcenter PN53.
I tried to check if the suspend issue is present in my installation or even live disk has the same.
It appears the issue is persistent across both.
Later I tried using ubuntu booted to tty2 without gdm3. suspend resume works perfectly fine. I tried exercising this cycle over 20 times, none failed. After this I logged into gdm3 from tty1 and tried running same command `sudo systemctl suspend` and it failed in first go.
with journalctl -b-1 the last log i see is `kernel: PM: suspend entry (s2idle)`