platform/x86: thinkpad_acpi: Fix max_brightness of thinklight

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[ Upstream commit db5e2a4ca0 ]

Thinklight has only two values, on/off so it's reasonable for
max_brightness to be 0 and 1 as if you write anything between 0 and 255
it will be 255 anyway so there's no point for it to be 255.

This may look like it is a userspace API change, but writes with
a value larget then the new max_brightness will still be accepted,
these will be silently clamped to the new max_brightness by
led_set_brightness_nosleep(). So no userspace API problems are
expected.

Reported-by: Michał Szczepaniak <m.szczepaniak.000@gmail.com>
Link: https://lore.kernel.org/platform-driver-x86/55400326-e64f-5444-94e5-22b8214d00b6@gmail.com/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Hans de Goede 2022-11-07 13:43:22 +01:00 • committed by Greg Kroah-Hartman

parent 3ff594fb49

commit f48a74ccb5

1 changed files with 1 additions and 0 deletions

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drivers/platform/x86/thinkpad_acpi.c

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