Carmine, a Lenovo Thinkpad T560, stopped waking up from suspend after Ubuntu was upgraded from 22.04 to 24.04. After a suspend, the only recourse was to hold the power button down for five seconds until the laptop powered off, then restart it.
The fix is to update this line in /etc/default/grub:
GRUB_CMDLINE_LINUX="intel_iommu=off"
Then run
sudo update-grub
to generate the grub configuration.
Here is relevant information:
Bug 197029 – intel_iommu=on breaks resume from suspend on several Thinkpad models
Ubuntu 24.04 LTS does not wake up or repond after being idle for some time
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