linux/drivers/platform
Rong Zhang ec1aa39ea7 platform/x86: ideapad-laptop: Fix kbd backlight not remembered among boots
commit e10981075a upstream.

On some models supported by ideapad-laptop, the HW/FW can remember the
state of keyboard backlight among boots. However, it is always turned
off while shutting down, as a side effect of the LED class device
unregistering sequence.

This is inconvenient for users who always prefer turning on the
keyboard backlight. Thus, set LED_RETAIN_AT_SHUTDOWN on the LED class
device so that the state of keyboard backlight gets remembered, which
also aligns with the behavior of manufacturer utilities on Windows.

Fixes: 503325f84b ("platform/x86: ideapad-laptop: add keyboard backlight control support")
Cc: stable@vger.kernel.org
Signed-off-by: Rong Zhang <i@rong.moe>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250707163808.155876-3-i@rong.moe
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-08-28 16:24:04 +02:00
..
chrome platform/chrome: cros_ec_typec: Check for EC driver 2025-02-01 18:24:01 +01:00
goldfish platform/goldfish: Convert pipe tasklet to threaded irq 2021-01-27 14:57:06 +01:00
mellanox platform/mellanox: mlxbf-tmfifo: fix vring_desc.len assignment 2025-07-10 15:57:43 +02:00
mips platform: mips: cpu_hwmon: Disable driver on unsupported hardware 2024-08-19 05:45:20 +02:00
olpc platform/olpc: Fix uninitialized data in debugfs write 2022-08-17 14:23:58 +02:00
surface platform/surface: aggregator_registry: Add support for Surface Laptop Go 3 2024-10-17 15:10:33 +02:00
x86 platform/x86: ideapad-laptop: Fix kbd backlight not remembered among boots 2025-08-28 16:24:04 +02:00
Kconfig platform: Add Surface platform directory 2020-10-27 12:51:03 +01:00
Makefile platform: Add Surface platform directory 2020-10-27 12:51:03 +01:00