I'm running a T560 for many years, it always had problems coming back from suspend. It wasn't related to any kernel version starting from 5.10.x A half way working work around was to send the laptop into hybrid sleep. It wouldn't come back from sleep when the lid was opened or the power button was pressed, but hard resetting it, at least allowed me to hibernate from disc. After that initial procedure it worked for weeks or even month with at least opening and closing the lid once a day. But recently (after more than 3 month running without a reboot) that trick didn't do it anymore. I couldn't figure out why. I even updated the bios without any success.
Setting 'Discrete TPM' finally made it work again, even without any work around. Uwe
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