[Bug 214899] ideapad-laptop: brightness hotkeys not working

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https://bugzilla.kernel.org/show_bug.cgi?id=214899

--- Comment #35 from Hans de Goede (jwrdegoede@xxxxxxxxxxxxxxxxx) ---
I think I know what is going on here:

1. acpi_bus_init() calls acpi_ec_ecdt_probe()
2. acpi_ec_ecdt_probe() calls acpi_ec_setup()
3. acpi_ec_setup() calls ec_install_handlers()
4. ec_install_handlers() calls acpi_install_address_space_handler()
5. acpi_install_address_space_handler() calls _REG for Device (EC0)
6. acpi_bus_init() calls acpi_initialize_objects(), but _REG has already run

I've a plan for fixing this. I hope to have a set of patches for you to test in
a couple of hours.

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