[PATCH 5.15 094/570] ACPI: OSI: Add DMI quirk for Acer Aspire One D255

Greg Kroah-Hartman
2026-04-13T16:23:31Z

From: Sofia Schneider <sofia@schn.dev>

[ Upstream commit 5ede90206273ff156a778254f0f972a55e973c89 ]

The screen backlight turns off during boot (specifically during udev device
initialization) when returning true for _OSI("Windows 2009").

Analyzing the device's DSDT reveals that the firmware takes a different
code path when Windows 7 is reported, which leads to the backlight shutoff.
Add a DMI quirk to invoke dmi_disable_osi_win7 for this model.

Signed-off-by: Sofia Schneider <sofia@schn.dev>
Link: https://patch.msgid.link/20260223025240.518509-1-sofia@schn.dev
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/acpi/osi.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
index d93409f2b2a07..6913264490225 100644
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -413,6 +413,19 @@ static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
},
},

+ /*
+ * The screen backlight turns off during udev device creation
+ * when returning true for _OSI("Windows 2009")
+ */
+ {
+ .callback = dmi_disable_osi_win7,
+ .ident = "Acer Aspire One D255",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "AOD255"),
+ },
+ },
+
/*
* The wireless hotkey does not work on those machines when
* returning true for _OSI("Windows 2012")
--
2.51.0