ACPI has been the bane of Linux on laptops for two decades.
If I can't trust that my laptop will go to sleep when I shut the lid and put it in my bag, it's not useful as a portable device.
If I can't trust that my laptop will go to sleep when I shut the lid and put it in my bag, it's not useful as a portable device.
Then at some point they fixed the issue, which if I remember correctly came down to "stop trying to be fancy and just do the straight-forward thing, which is correct". And since then I've had no issues.
I'm unclear why I had an issue with the Thinkpad but never had issues with any of the 5 or so Dell Inspirons I've had over the years.