tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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ACPI: OSI: Add DMI quirk for Acer Aspire One D255

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>

authored by

Sofia Schneider and committed by
Rafael J. Wysocki 5ede9020 6de23f81

+13
+13
drivers/acpi/osi.c
··· 390 390 }, 391 391 392 392 /* 393 + * The screen backlight turns off during udev device creation 394 + * when returning true for _OSI("Windows 2009") 395 + */ 396 + { 397 + .callback = dmi_disable_osi_win7, 398 + .ident = "Acer Aspire One D255", 399 + .matches = { 400 + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 401 + DMI_MATCH(DMI_PRODUCT_NAME, "AOD255"), 402 + }, 403 + }, 404 + 405 + /* 393 406 * The wireless hotkey does not work on those machines when 394 407 * returning true for _OSI("Windows 2012") 395 408 */