Lenovo Yoga Book uses PWM2 for controlling keyboard backlight but this
device is hidden in the DSDT in Windows version of notebook (if OSID == 1).
Make this device always present for this notebook.
Signed-off-by: Yauhen Kharuzhy <jekhor@xxxxxxxxx>
---
drivers/acpi/x86/utils.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 9a8e286dd86f..c6df14802741 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -56,6 +56,11 @@ static const struct always_present_id always_present_ids[] = {
*/
ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT), {}),
ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
+
+ /* Lenovo Yoga Book uses PWM2 for keyboard backlight control */
+ ENTRY("80862289", "2", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
+ DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"),
+ }),
/*
* The INT0002 device is necessary to clear wakeup interrupt sources
* on Cherry Trail devices, without it we get nobody cared IRQ msgs.
--
2.20.1
