linux-kernel - [PATCH 0/2] Save Brightness on Macs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260206125641.12983-1-atharvatiwarilinuxdev@gmail.com>
Date: Fri,  6 Feb 2026 12:56:20 +0000
From: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
To: 
Cc: Lukas Wunner <lukas@...ner.de>,
	Atharva Tiwari <atharvatiwarilinuxdev@...il.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Hans de Goede <hansg@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Subject: [PATCH 0/2] Save Brightness on Macs

Currently, when a Mac is rebooted, the display brightness does not reflect
the level used during the previous boot. Instead, the brightness is
reset to the value last stored by macOS, causing the system to
ignore any changes made since that time.

We fix this by writing the brightness value to efivar "backlight-level"
every 300ms.

Atharva Tiwari (2):
  efi: Save Brightness using EFI on Macs
  platform/apple-gmux: use apple_brightness to save brightness to EFI

 drivers/firmware/efi/Kconfig                  | 10 ++
 drivers/firmware/efi/Makefile                 |  1 +
 drivers/firmware/efi/apple-brightness.c       | 91 +++++++++++++++++++
 drivers/platform/x86/apple-gmux.c             |  7 ++
 .../linux/platform_data/apple-brightness.h    | 21 +++++
 5 files changed, 130 insertions(+)
 create mode 100644 drivers/firmware/efi/apple-brightness.c
 create mode 100644 include/linux/platform_data/apple-brightness.h

-- 
2.43.0