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CONFIG_ACPI_REV_OVERRIDE_POSSIBLE: Allow supported ACPI revision to be overriden

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The Linux kernel configuration item CONFIG_ACPI_REV_OVERRIDE_POSSIBLE:

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The platform firmware on some systems expects Linux to return "5" as the supported ACPI revision which makes it expose system configuration information in a special way.

For example, based on what ACPI exports as the supported revision, Dell XPS 13 (2015) configures its audio device to either work in HDA mode or in I2S mode, where the former is supposed to be used on Linux until the latter is fully supported (in the kernel as well as in user space).

This option enables a DMI-based quirk for the above Dell machine (so that HDA audio is exposed by the platform firmware to the kernel) and makes it possible to force the kernel to return "5" as the supported ACPI revision via the "acpi_rev_override" command line switch.

Hardware

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