This fix might do the trick:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2031969/comments/27
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https://bugs.launchpad.net/bugs/1970957
Title:
suspend problem
Stat
I'm not sure exactly why, but this worked:
https://www.reddit.com/r/debian/comments/t03sd2/fresh_install_on_t460_laptop_wont_wake_after/
Change the /etc/default/grub command line to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=off"
and my Thinkpad Carbon X1 (G4?) sleeps and wakes up as
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