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

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Message-ID: <20260125001111.1269-3-atharvatiwarilinuxdev@gmail.com>
Date: Sun, 25 Jan 2026 00:11:01 +0000
From: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
To: 
Cc: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>,
	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>,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 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>
---
 drivers/gpu/drm/i915/display/intel_display_device.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 1170afaa8680..3fb47232e7a4 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>
@@ -1657,6 +1658,7 @@ struct intel_display *intel_display_device_probe(struct pci_dev *pdev,
 	const struct platform_desc *desc;
 	const struct subplatform_desc *subdesc;
 	enum intel_step step;
+	const char *product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
 
 	display = kzalloc(sizeof(*display), GFP_KERNEL);
 	if (!display)
@@ -1674,6 +1676,11 @@ struct intel_display *intel_display_device_probe(struct pci_dev *pdev,
 		goto no_display;
 	}
 
+	if (dmi_match(DMI_BOARD_VENDOR, "Apple Inc.") && !strncmp(product_name, "iMac", 4)) {
+		drm_dbg_kms(display->drm, "iMac Detected, Disabling display\n");
+		goto no_display;
+	}
+
 	desc = find_platform_desc(pdev);
 	if (!desc) {
 		drm_dbg_kms(display->drm,
-- 
2.43.0