platform/x86: lg-laptop: Fix keyboard backlight support on LG Gram 16T90SP

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On the LG Gram 16T90SP, the ACPI firmware will only accept the values
0x80, 0xA2 and 0xA4 when setting the keyboard backlight. After a bit
of research using ACPI tables from older models it seems that bit 8
is supposed to be always written as 1.

Fix the keyboard backlight support on this model by always setting
bit 8 inside the argument passed to the WMAB ACPI control method.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/20260708195553.7762-6-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Armin Wolf 2026-07-08 21:55:53 +02:00 • committed by Ilpo Järvinen

parent 9f57244922

commit 543efc52be

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1 changed files with 36 additions and 11 deletions

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drivers/platform/x86/lg-laptop.c

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