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[ Upstream commit 444a9256f8d106e08a6bc2dc8ef28a8699e4b3ba ] On the Acer Nitro AN515-58, the event 4 - 0 is send by the ACPI firmware when the backlight up/down keys are pressed. Ignore this event to avoid spamming the kernel log with error messages, as the acpi-video driver already handles brightness up/down events. Reported-by: Bugaddr <Bugaddr@protonmail.com> Closes: https://bugaddr.tech/posts/2025-11-16-debugging-the-acer-nitro-5-an515-58-fn-f10-keyboard-backlight-bug-on-linux/#wmi-interface-issues Tested-by: Bugaddr <Bugaddr@protonmail.com> Signed-off-by: Armin Wolf <W_Armin@gmx.de> Link: https://patch.msgid.link/20251117155938.3030-1-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Ulrich Hecht <uli@kernel.org>