feat: Add acpi_call kernel module

[cr7pt0gr4ph7]

Add the acpi_call¹ kernel module to the extra/ stream.

Note about the current build failure: This PR is written as-if the COPR build for acpi_call-kmod and acpi_call-kmod-common had already been set up at https://copr.fedorainfracloud.org/coprs/ublue-os/akmods/ - preferably sourced from github.com/nix-community/acpi_call once nix-community/acpi_call#28 has been merged².

Until that PR has been merged, an example COPR build of acpi_call-kmod and acpi_call-kmod-common can be found at https://copr.fedorainfracloud.org/coprs/cr7pt0gr4ph7/acpi_call/, currently using my own acpi_call repository fork, and example image builds can be found at https://github.com/cr7pt0gr4ph7/akmods/actions.

Footnotes

1. The acpi_call module allows one to manually issue ACPI method calls, which is useful to advanced users for disabling discrete Nvidia graphics cards on older laptops with hybrid Intel+Nvidia graphics where no option for this is available in the BIOS, as well as for interacting e.g. with Firmware-based fan control when no specific driver is available. ↩

2. As it appears, the people from the NixOS community now seem to be the de-facto maintainers of the acpi_call module. ↩