tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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platform/x86: acer-wmi: Ignore backlight event

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>

authored by

Armin Wolf and committed by
Ilpo Järvinen 444a9256 d8bb447e

+4
+4
drivers/platform/x86/acer-wmi.c
··· 102 102 103 103 enum acer_wmi_event_ids { 104 104 WMID_HOTKEY_EVENT = 0x1, 105 + WMID_BACKLIGHT_EVENT = 0x4, 105 106 WMID_ACCEL_OR_KBD_DOCK_EVENT = 0x5, 106 107 WMID_GAMING_TURBO_KEY_EVENT = 0x7, 107 108 WMID_AC_EVENT = 0x8, ··· 2369 2368 } 2370 2369 sparse_keymap_report_event(acer_wmi_input_dev, scancode, 1, true); 2371 2370 } 2371 + break; 2372 + case WMID_BACKLIGHT_EVENT: 2373 + /* Already handled by acpi-video */ 2372 2374 break; 2373 2375 case WMID_ACCEL_OR_KBD_DOCK_EVENT: 2374 2376 acer_gsensor_event();