FAILED: Patch "drm/amdgpu: keep vga memory on MacBooks with switchable graphics" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 096bb75e13cc508d3915b7604e356bcb12b17766 Mon Sep 17 00:00:00 2001
From: Alex Deucher <[email protected]>
Date: Mon, 16 Feb 2026 10:02:32 -0500
Subject: [PATCH] drm/amdgpu: keep vga memory on MacBooks with switchable
graphics

On Intel MacBookPros with switchable graphics, when the iGPU is enabled, the address of VRAM gets put at 0 in the dGPU's virtual address space. This is non-standard and seems to cause issues with the cursor if it ends up at 0. We have the framework to reserve memory at 0 in the address space, so enable it here if the vram start address is 0.

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

index d35d9719d5668..6a6b334428f6d 100644
@@ -1068,6 +1068,16 @@ void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
 	case CHIP_RENOIR:
 		adev->mman.keep_stolen_vga_memory = true;
 		break;
+	case CHIP_POLARIS10:
+	case CHIP_POLARIS11:
+	case CHIP_POLARIS12:
+		/* MacBookPros with switchable graphics put VRAM at 0 when
+		 * the iGPU is enabled which results in cursor issues if
+		 * the cursor ends up at 0.  Reserve vram at 0 in that case.
+		 */
+		if (adev->gmc.vram_start == 0)
+			adev->mman.keep_stolen_vga_memory = true;
+		break;
 	default:
 		adev->mman.keep_stolen_vga_memory = false;
 		break;

2.51.0