In the Arch Wiki I see that the two kernel variables CONFIG_EFIVAR_FS & CONFIG_EFI_VARS should be set =y and =n respectively. Arch says, “This option should be disabled to prevent any potential issues with both efivarfs and sysfs-efivars enabled.” In Ubuntu 20.04, they are both set to =y. If I am understanding correctly, it appears that as a result, I have both dump-* files in /sys/firmware/efi/efivars and dump-* directories in /sys/firmware/efi/vars.
$ ls -l efivars/dump*
-rw-r--r-- 1 root root 644 Feb 27 00:12 efivars/dump-type0-10-1-1645912016-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
[& etc.]
$ ls -l vars/dump*
vars/dump-type0-10-1-1645912016-C-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0:
total 0
-r-------- 1 root root 4096 Feb 27 00:48 attributes
-r-------- 1 root root 4096 Feb 27 00:48 data
-r-------- 1 root root 4096 Feb 27 00:48 guid
-rw------- 1 root root 4096 Feb 27 00:48 raw_var
-r-------- 1 root root 4096 Feb 27 00:48 size
[& etc.]
As my NVRAM has been filled up with these (see here and here for troubles due to the acpi-call package, particularly in aging Thinkpads), I am wondering if my understanding is correct, and that therefore I need to remove both the files and the directories and their contents?
