Me and my brothers each own a Thinkpad x131e and were running Ubuntu 20.04 with 
tlp very smoothly. Until with the recent kernel update 5.13 three weeks ago 
each of us encountered the error `Error: The Non-Volatile Variable Storage is 
About Full` on boot. At first the error could be ignored by entering BIOS setup 
and save settings. But after a few restarts it was stuck when the error message 
appears, not even being able to enter BIOS setup or to boot. Unlike newer 
Thinkpads (e.g. X1) this model does not provide a firmware option to clear the 
NVRAM storage if it is full. Two of us could not resolve the issue before this 
to happen – so our ThinkPads are now BRICKED!!!
At least one of us could rescue his Laptop so far by deleting the dump-* files 
in /etc/firmware/efi/efivars and not restarting the laptop, only using standby. 
We then found the fix by 
https://gist.github.com/roadkell/9e98db6656e28fbbf1bf51082040f67f and manually 
installing the acpi-call module 1.2.2 from the nix-community made the error on 
boot go away. So big thanks to them!

I know this bug is not the fault of the Ubuntu team, but nevertheless
it's quite unacceptable that an update destroys our hardware. This got
me in the middle of my exams and a project I had to finish. I know some
people would say this laptop model is quite old, buy a new one. But I
choose Ubuntu because of sustainability – because it doesn't force you
to buy new hardware every two years. Me and my brothers had our ThinkPad
x131e's perfectly up to speed with modern SSD and RAM doing audio
editing and blender animations. And now it's just not booting anymore
because NVRAM memory chip is full.

So I suggest getting the acpi-call package version 1.2.2 into every
release of Ubuntu as soon as possible so no more hardware gets
destroyed!

I hope I will find someone who can somehow physically reset the chip on
the motherboards that are now unbootable. Removing the CMOS-Battery did
not clear the NVRAM. Any thoughts on this? Any help appreciated!

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https://bugs.launchpad.net/bugs/1953261

Title:
  kernel >= 5.13 BUG: kernel NULL pointer dereference

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