linux-kernel - [PATCH v2 2/2] drm/i915/display: Disable display for iMac's

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Message-ID: <20260128145855.1071-3-atharvatiwarilinuxdev@gmail.com>
Date: Wed, 28 Jan 2026 14:58:38 +0000
From: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
To: 
Cc: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Javier Martinez Canillas <javierm@...hat.com>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Lenny Szubowicz <lszubowi@...hat.com>,
	Francesco Pompo <francescopompo2@...il.com>,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 2/2] drm/i915/display: Disable display for iMac's

Disable display on iMacs, as they can't do link training
on the internal display.

(tested on iMac20,1)

Signed-off-by: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
---
 .../gpu/drm/i915/display/intel_display_device.c    | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 1170afaa8680..b1fec1018d7e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -3,6 +3,7 @@
  * Copyright © 2023 Intel Corporation
  */
 
+#include <linux/dmi.h>
 #include <linux/pci.h>
 
 #include <drm/drm_color_mgmt.h>
@@ -1435,7 +1436,18 @@ static bool has_no_display(struct pci_dev *pdev)
 		{}
 	};
 
-	return pci_match_id(ids, pdev);
+	static const struct dmi_system_id dmi_ids[] = {
+		{
+			.ident = "Apple Inc. iMac",
+			.matches = {
+				DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
+				DMI_MATCH(DMI_PRODUCT_NAME, "iMac"),
+			}
+		},
+		{}
+	};
+
+	return pci_match_id(ids, pdev) || dmi_check_system(dmi_ids);
 }
 
 #define INTEL_DISPLAY_DEVICE(_id, _desc) { .devid = (_id), .desc = (_desc) }
-- 
2.43.0