On updated amber on librem 13.
$ sudo apt install acpi-call-dkms Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: acpi-call-dkms 0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded. Need to get 13,6 kB of archives. After this operation, 48,1 kB of additional disk space will be used. Get:1 https://repo.pureos.net/pureos amber/main amd64 acpi-call-dkms all 1.1.0-5 [13,6 kB] Fetched 13,6 kB in 1s (15,5 kB/s) Selecting previously unselected package acpi-call-dkms. (Reading database ... 323824 files and directories currently installed.) Preparing to unpack .../acpi-call-dkms_1.1.0-5_all.deb ... Unpacking acpi-call-dkms (1.1.0-5) ... Setting up acpi-call-dkms (1.1.0-5) ... Loading new acpi-call-1.1.0 DKMS files... Building for 4.19.0-5-amd64 Building initial module for 4.19.0-5-amd64 Done. acpi_call.ko: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/4.19.0-5-amd64/extra/ depmod... DKMS: install completed. Scanning processes... Scanning linux images... Running kernel seems to be up-to-date. Failed to check for processor microcode upgrades. No services need to be restarted. No containers need to be restarted. No user sessions are running outdated binaries. $ sudo modprobe acpi-call modprobe: ERROR: could not insert 'acpi_call': Exec format error