[PATCH] platform/x86: asus-wmi: fix FA401 series keyboard sleep strobe
From: Idotoho Reimon Simanjuntak
Date: Tue Sep 01 2026 - 21:54:56 EST
The FA401 series accepts the TUF keyboard RGB power-state command but does
not advertise the device through the normal DSTS presence probe. Register
the state attributes for this series and re-assert keyboard brightness in
the PM prepare callback so the EC enters S0ix with the correct state.
Without the brightness re-assertion, the display server blanks the keyboard
before the kernel suspend path runs, leaving the EC with brightness=0 and
preventing the sleep strobe from activating. Because kbd_led_wk may already
be zeroed by the display server at prepare time, always re-assert level 3
(max) brightness; the sleep strobe requires a non-zero brightness to
activate.
Use a quirk flag (kbd_rgb_state_quirk) set via DMI match table rather than
ad-hoc dmi_match() calls. Use the standard dev_pm_ops .prepare callback
rather than overloading the Ally-specific LPS0 ops. Define self-documenting
macros for the TUF RGB state bitfields at file scope.
Signed-off-by: Idotoho Reimon Simanjuntak <idotohors@xxxxxxxxx>
---
drivers/platform/x86/asus-nb-wmi.c | 14 ++++++++++
drivers/platform/x86/asus-wmi.c | 43 +++++++++++++++++++++++++++++-
drivers/platform/x86/asus-wmi.h | 1 +
3 files changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index aeb461b16..fb06013ca 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -155,6 +155,11 @@ static struct quirk_entry quirk_asus_z13 = {
.tablet_switch_mode = asus_wmi_kbd_dock_devid,
};
+static struct quirk_entry quirk_asus_fa401 = {
+ .wapf = 0,
+ .kbd_rgb_state_quirk = true,
+};
+
static int dmi_matched(const struct dmi_system_id *dmi)
{
pr_info("Identified laptop model '%s'\n", dmi->ident);
@@ -163,6 +168,15 @@ static int dmi_matched(const struct dmi_system_id *dmi)
}
static const struct dmi_system_id asus_quirks[] = {
+ {
+ .callback = dmi_matched,
+ .ident = "ASUSTeK COMPUTER INC. FA401",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_BOARD_NAME, "FA401"),
+ },
+ .driver_data = &quirk_asus_fa401,
+ },
{
.callback = dmi_matched,
.ident = "ASUSTeK COMPUTER INC. Q500A",
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index a65090429..8d7c9e8bd 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -129,6 +129,14 @@ module_param(fnlock_default, bool, 0444);
#define ASUS_SCREENPAD_BRIGHT_MAX 255
#define ASUS_SCREENPAD_BRIGHT_DEFAULT 60
+/* TUF RGB power state bitfields for DEVS(ASUS_WMI_DEVID_TUF_RGB_STATE) */
+#define TUF_RGB_STATE_CMD 0xbd
+#define TUF_RGB_STATE_SAVE BIT(8)
+#define TUF_RGB_STATE_BOOT (0x03 << 16)
+#define TUF_RGB_STATE_AWAKE (0x0c << 16)
+#define TUF_RGB_STATE_SLEEP (0x30 << 16)
+#define TUF_RGB_STATE_KEYBOARD (0xc0 << 16)
+
#define ASUS_MINI_LED_MODE_MASK 0x03
/* Standard modes for devices with only on/off */
#define ASUS_MINI_LED_OFF 0x00
@@ -5153,7 +5161,6 @@ static int asus_wmi_add(struct platform_device *pdev)
asus->egpu_enable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_EGPU);
asus->dgpu_disable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_DGPU);
- asus->kbd_rgb_state_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE);
if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_MINI_LED_MODE))
asus->mini_led_dev_id = ASUS_WMI_DEVID_MINI_LED_MODE;
@@ -5166,6 +5173,15 @@ static int asus_wmi_add(struct platform_device *pdev)
asus->gpu_mux_dev = ASUS_WMI_DEVID_GPU_MUX_VIVO;
#endif /* IS_ENABLED(CONFIG_ASUS_WMI_DEPRECATED_ATTRS) */
+ /*
+ * FA401 series accepts the TUF RGB-state DEVS command but does not
+ * advertise the device through DSTS. Keep the normal DSTS probe for
+ * other models and force registration when the quirk is set.
+ */
+ asus->kbd_rgb_state_available =
+ asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE) ||
+ asus->driver->quirks->kbd_rgb_state_quirk;
+
asus->oobe_state_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_OOBE);
if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY))
@@ -5396,11 +5412,36 @@ static int asus_hotk_restore(struct device *device)
static int asus_hotk_prepare(struct device *device)
{
+ struct asus_wmi *asus = dev_get_drvdata(device);
+
if (use_ally_mcu_hack == ASUS_WMI_ALLY_MCU_HACK_ENABLED) {
acpi_execute_simple_method(NULL, ASUS_USB0_PWR_EC0_CSEE,
ASUS_USB0_PWR_EC0_CSEE_OFF);
msleep(ASUS_USB0_PWR_EC0_CSEE_WAIT);
}
+
+ /*
+ * The display server may blank the keyboard backlight before the
+ * kernel suspend path runs. Re-assert brightness and power-state
+ * flags so the EC enters S0ix with the correct state. Always use
+ * level 3 (max) because kbd_led_wk may already be zeroed by the
+ * display server at this point, and the sleep strobe requires a
+ * non-zero brightness to activate.
+ */
+ if (asus && asus->driver->quirks->kbd_rgb_state_quirk &&
+ asus->kbd_rgb_state_available) {
+ u8 brightness = 0x80 | 0x03; /* level 3 (max) + light-on bit */
+
+ asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT,
+ brightness, NULL);
+ asus_wmi_evaluate_method3(ASUS_WMI_METHODID_DEVS,
+ ASUS_WMI_DEVID_TUF_RGB_STATE,
+ TUF_RGB_STATE_CMD | TUF_RGB_STATE_SAVE |
+ TUF_RGB_STATE_BOOT | TUF_RGB_STATE_AWAKE |
+ TUF_RGB_STATE_SLEEP | TUF_RGB_STATE_KEYBOARD,
+ 0, NULL);
+ }
+
return 0;
}
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 5cd4392b9..69d224774 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -52,6 +52,7 @@ struct quirk_entry {
*/
int no_display_toggle;
u32 xusb2pr;
+ bool kbd_rgb_state_quirk;
};
struct asus_wmi_driver {
--
2.55.0