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([2a01:e0a:f29:5290:1f7d:16b7:b5dc:8a81]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47f63ee9281sm11898573f8f.36.2026.07.18.02.05.30 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 18 Jul 2026 02:05:31 -0700 (PDT) Message-ID: <69a1eaf0-4a58-47d5-ad94-2af958f84841@gmail.com> Date: Sat, 18 Jul 2026 11:05:30 +0200 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: linux-acpi@vger.kernel.org From: harryblanc Subject: =?UTF-8?Q?Regression=3A_Backlight_control_broken_on_HP_Omen_15?= =?UTF-8?B?4oCRYXgyNDZuZiB3aXRoIGtlcm5lbCA3LjAuMOKAkTI44oCRZ2VuZXJpYw==?= Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, I would like to report a regression affecting backlight control on my HP Omen laptop when using kernel 7.0.0‑28‑generic (Ubuntu 24.04 base, Linux Mint 22.3 XFCE). Summary of the issue: With kernel 7.0, the screen backlight is stuck at maximum brightness. Brightness keys show the OSD and the slider moves, but the actual backlight does not change. With kernel 6.17, brightness works normally. Hardware: - HP Omen 15‑ax246nf - Intel i5‑7300HQ - Intel HD Graphics 630 (i915) - Nvidia GTX 1050 Mobile (disabled via Optimus) - Linux Mint 22.3 XFCE (Ubuntu 24.04 base) Backlight controller: /sys/class/backlight/ → intel_backlight acpi_video0 is no longer present under kernel 7.0. ACPI errors visible only with kernel 7.0: ACPI BIOS Error (bug): Attempt to CreateField of length zero ACPI Error: Aborting method \_SB.WMID.WQBK ACPI BIOS Error (bug): AE_AML_BUFFER_LIMIT ACPI Error: Aborting method \_SB.WMID.HWMC ACPI: video: [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS Kernel version: Linux 7.0.0-28-generic #28~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Jul 1 15:50:57 UTC 2024 x86_64 GNU/Linux GPU information (inxi -Gxxx): Device-1: Intel HD Graphics 630 driver: i915 Device-2: NVIDIA GTX 1050 Mobile driver: N/A (Optimus disabled) Display: X11 driver: modesetting, iris Monitor: eDP-1 1920x1080 LG Display Hardware summary (lshw -short): Intel(R) Core(TM) i5-7300HQ HD Graphics 630 GeForce GTX 1050 Mobile (disabled) 16 GiB DDR4 Samsung NVMe SSD + 1TB HDD Expected behavior: Backlight should be adjustable via intel_backlight or acpi_video0, as in kernel 6.17. Observed behavior: Backlight remains at maximum brightness regardless of ACPI events or brightness keys. Steps to reproduce: 1. Boot kernel 7.0.0‑28‑generic 2. Attempt to change brightness 3. Backlight does not change This appears to be an ACPI/i915 regression introduced in kernel 7.0. Thank you for your work.