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Re: [sid] efibootmgr not working on linux 5.10.x [solved]

On 5/6/21 1:10 PM, Steve McIntyre wrote:

Hi!

pld@sojka.co wrote:

On 4/10/21 7:52 PM, Sven Joachim wrote:

On 2021-04-08 22:30 +0200, Grzesiek wrote:


The problem seems to be related to 5.10.x kernels & LGA1155 based systems.

1. On laptop based on i5-8250u efibootmgr works fine (all kernel versions)

2. On systems based on LGA1155 socket (i5-2500k, i7-3770):
- kernels 5.10.x: efibootmgr does not work,
directory /sys/firmware/efi/efivars is empty
- kernel 5.8.0-2: efibootmgr woks as expected

On 5.8.0-2 i get:

# lsmod | grep efi
efivarfs               16384  0
efi_pstore             16384  0
efivars                20480  1 efi_pstore

There is no efivars.ko in 5.10.x. Maybe that is the problem?


The efivars module has indeed been removed from Debian's 5.10 kernels,
as it had been deprecated in favor of efivarfs for a while.

Which versions of efibootmgr and libefivar1 do you have installed?


The problem persists since several months. Now I have:

# apt-list | grep efi
efibootmgr/unstable,now 17-1 amd64 [installed]
libefiboot1/unstable,now 37-6 amd64 [installed,automatic]
libefivar1/unstable,now 37-6 amd64 [installed,automatic]


This line:

efivarfs               16384  0

suggests the cause of the problem for you. efibootmgr (and other tools
using libefivar) will look into both:

  * /sys/firmware/efi/vars (the old, deprecated interface that was
    removed in 5.10)
  * /sys/firmware/efi/efivars (the new interface, provided by efivarfs)

As you have efivarfs loaded but with use-count of 0, that suggests
that you don't have the efivarfs pseudo-filesystem mounted. This
should normally be automatically mounted on system boot, along with
the other pseudo-filesystems like /sys and /proc.
Thanks! Manually mounting solved the problem. Which service is responsible for mounting /sys/firmware/efi/efivars?
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