3 comments:
I believe
gfx.asl should be removed, but would like to hear alternatives.
It seems empty (the _ADR only has meaning if there is something more associated with the device node). I would remove it.
Patch Set #1, Line 14: Tested on system76/lemp9 - ACPI backlight control was verified.
Alas, there are many paths to test. The most common one with modern Linux
distributions is that ACPI only receives an event and then calls the i915
driver via IGD OpRegion to actually change the brightness. If there is no
graphics driver loaded (yet), the ASL code writes registers directly and
these registers have to be configured as they differ from chip to chip, see
`INTEL_GMA_BCL*` in `src/drivers/intel/gma/Kconfig`.
File src/soc/intel/cannonlake/chip.h:
Patch Set #1, Line 483: backlight control
It's mostly about the available display ports and only indirectly related to
backlight controls (i.e. when an internal panel is advertised to the OS).
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