[PATCH] ACPI: OSI: Add DMI quirk for Acer Aspire One D255

[PATCH] ACPI: OSI: Add DMI quirk for Acer Aspire One D255

[Sofia Schneider]

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>
---
 drivers/acpi/osi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
index f2c943b934be..9470f1830ff5 100644
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -389,6 +389,19 @@ 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")
-- 
2.53.0

Re: [PATCH] ACPI: OSI: Add DMI quirk for Acer Aspire One D255

[Rafael J. Wysocki]

On Mon, Feb 23, 2026 at 4:00 AM Sofia Schneider <sofia@schn.dev> wrote:
>
> 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>
> ---
>  drivers/acpi/osi.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
> index f2c943b934be..9470f1830ff5 100644
> --- a/drivers/acpi/osi.c
> +++ b/drivers/acpi/osi.c
> @@ -389,6 +389,19 @@ 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")
> --

Applied as 7.0-rc material, thanks!