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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/gpu/drm/radeon/atombios_encoders.c
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@@ -2191,11 +2191,12 @@
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 	/*
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 	 * On DCE32 any encoder can drive any block so usually just use crtc id,
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-	 * but Apple thinks different at least on iMac10,1, so there use linkb,
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+	 * but Apple thinks different at least on iMac10,1 and iMac11,2, so there use linkb,
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 	 * otherwise the internal eDP panel will stay dark.
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 	 */
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 	if (ASIC_IS_DCE32(rdev)) {
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-		if (dmi_match(DMI_PRODUCT_NAME, "iMac10,1"))
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+		if (dmi_match(DMI_PRODUCT_NAME, "iMac10,1") ||
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+		    dmi_match(DMI_PRODUCT_NAME, "iMac11,2"))
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 			enc_idx = (dig->linkb) ? 1 : 0;
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 		else
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 			enc_idx = radeon_crtc->crtc_id;