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ACPI: video: force native backlight on HP OMEN 16 (8A44)

The HP OMEN 16 Gaming Laptop (board name 8A44) has a mux-less hybrid
GPU configuration with AMD Rembrandt (Radeon 680M) and NVIDIA GA104
(RTX 3070 Ti). The internal eDP panel is wired to the AMD iGPU.

When Nouveau loads without GSP firmware, the ACPI video backlight
device (acpi_video0) gets registered alongside the native AMD
backlight (amdgpu_bl2). In this state, writes to amdgpu_bl2 update
the software brightness value but fail to change the physical panel
brightness.

Force native backlight to prevent acpi_video0 from registering.
Confirmed that booting with acpi_backlight=native resolves the
issue.

Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Shivam Kalra <shivamkalra98@zohomail.in>
Link: https://patch.msgid.link/20260426-omen-16-backlight-fix-v1-1-62364f268ea6@zohomail.in
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

authored by

Shivam Kalra and committed by
Rafael J. Wysocki 4b506ea5 254f4963

+8
+8
drivers/acpi/video_detect.c
··· 916 916 DMI_MATCH(DMI_PRODUCT_NAME, "82K8"), 917 917 }, 918 918 }, 919 + { 920 + .callback = video_detect_force_native, 921 + /* HP OMEN Gaming Laptop 16-n0xxx */ 922 + .matches = { 923 + DMI_MATCH(DMI_SYS_VENDOR, "HP"), 924 + DMI_MATCH(DMI_PRODUCT_NAME, "OMEN by HP Gaming Laptop 16-n0xxx"), 925 + }, 926 + }, 919 927 920 928 /* 921 929 * x86 android tablets which directly control the backlight through