kernel/drivers/acpi/osi.c, branch linux-rolling-lts

ACPI: OSI: Add DMI quirk for Acer Aspire One D255

2026-03-19T15:08:10Z

[ 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 Link: https://patch.msgid.link/20260223025240.518509-1-sofia@schn.dev Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"

2025-05-16T13:53:26Z

As specified in section 5.7.2 of the ACPI specification the feature group string "3.0 _SCP Extensions" implies that the operating system evaluates the _SCP control method with additional parameters. However the ACPI thermal driver evaluates the _SCP control method without those additional parameters, conflicting with the above feature group string advertised to the firmware thru _OSI. Stop advertising support for this feature string to avoid confusing the ACPI firmware. Fixes: e5f660ebef68 ("ACPI / osi: Collect _OSI handling into one single file") Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20250410165456.4173-2-W_Armin@gmx.de Signed-off-by: Rafael J. Wysocki

ACPI: OSI: refactor deprecated strncpy()

2023-09-21T18:55:43Z

`strncpy()` is deprecated for use on NUL-terminated destination strings [1]. We know `osi->string` is a NUL-terminated string due to its eventual use in `acpi_install_interface()` and `acpi_remove_interface()` which expect a `acpi_string` which has been specifically typedef'd as: | typedef char *acpi_string; /* Null terminated ASCII string */ ... and which also has other string functions used on it like `strlen`. Furthermore, padding is not needed in this instance either. Due to the reasoning above a suitable replacement is `strscpy` [2] since it guarantees NUL-termination on the destination buffer and doesn't unnecessarily NUL-pad. While there is unlikely to be a buffer overread (or other related bug) in this case, we should still favor a more robust and less ambiguous interface. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Signed-off-by: Justin Stitt Reviewed-by: Kees Cook Signed-off-by: Rafael J. Wysocki

ACPI: OSI: Remove Linux-HPI-Hybrid-Graphics _OSI string

2022-08-25T18:18:17Z

This string was introduced because drivers for NVIDIA hardware didn't handle mux control properly. This was fixed by commit 8e55f99c510f ("drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops"), so vendors shouldn't be using this string to modify ASL any more. Suggested-by: Kai-Heng Feng Reviewed-by: Lyude Paul Signed-off-by: Mario Limonciello Signed-off-by: Rafael J. Wysocki

ACPI: OSI: Remove Linux-Lenovo-NV-HDMI-Audio _OSI string

2022-08-25T18:18:17Z

This string was introduced because drivers for NVIDIA hardware didn't handle HDMI properly. This was fixed by commit b516ea586d71 ("PCI: Enable NVIDIA HDA controllers"), so vendors shouldn't be using this string to modify ASL any more. Suggested-by: Kai-Heng Feng Reviewed-by: Lyude Paul Signed-off-by: Mario Limonciello Signed-off-by: Rafael J. Wysocki

ACPI: OSI: Remove Linux-Dell-Video _OSI string

2022-08-25T18:18:17Z

This string was introduced because drivers for NVIDIA hardware had bugs supporting RTD3 in the past. Before proprietary NVIDIA driver started to support RTD3, Ubuntu had had a mechanism for switching PRIME on and off, though it had required to logout/login to make the library switch happen. When the PRIME had been off, the mechanism had unloaded the NVIDIA driver and put the device into D3cold, but the GPU had never come back to D0 again which is why ODMs used the _OSI to expose an old _DSM method to switch the power on/off. That has been fixed by commit 5775b843a619 ("PCI: Restore config space on runtime resume despite being unbound"). so vendors shouldn't be using this string to modify ASL any more. Reviewed-by: Lyude Paul Signed-off-by: Mario Limonciello Signed-off-by: Rafael J. Wysocki

ACPI: OSI: Shoot duplicate word

2019-11-13T10:12:08Z

"this" is duplicated. Signed-off-by: Cao jin Signed-off-by: Rafael J. Wysocki

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

2019-05-30T18:26:37Z

Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Reviewed-by: Kate Stewart Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman

ACPI / OSI: Add OEM _OSI string to enable dGPU direct output

2018-12-18T10:06:05Z

For HP Inc. mobile workstation with hybrid graphics support, dGPU can directly output to external monitors; however, Nvidia and AMD's Linux drivers aren't able to support this feature. The OEM _OSI string "Linux-HPI-Hybrid-Graphics" is used by BIOS to implement dGPU direct output to external monitors. The form of the OEM _OSI strings is defined by each OEMs and is discussed in Documentation/acpi/osi.txt. Signed-off-by: Alex Hung Signed-off-by: Rafael J. Wysocki

ACPI / OSI: Add OEM _OSI string to enable NVidia HDMI audio

2018-07-20T08:12:41Z

Some ThinkPad systems have a power-saving feature that turns off HDMI audio device in Windows, but NVidia Linux driver does not support this feature. As a result, HDMI audio will not work on Linux. A BIOS workaround is added with an OEM_OSI string "Linux-Lenovo-NV-HDMI-Audio" to power on NVidia HDMI audio when booting. The form of the OEM _OSI strings is defined by each OEMs and is discussed in Documentation/acpi/osi.txt. Signed-off-by: Alex Hung Signed-off-by: Rafael J. Wysocki