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Fri, 25 Sep 2026 00:25:03 -0700 (PDT) From: =?UTF-8?q?Ayhan=20=C3=87i=C3=A7ek?= To: alexander.deucher@amd.com, christian.koenig@amd.com Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, airlied@gmail.com, simona@ffwll.ch, =?UTF-8?q?Ayhan=20=C3=87i=C3=A7ek?= Subject: [PATCH] drm/amdgpu: extend MacBook VRAM-at-0 workaround to VERDE Date: Fri, 25 Sep 2026 10:24:44 +0300 Message-ID: <20260925072444.18982-1-ayhancicek@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The existing MacBook workaround reserves VRAM at address 0 for Polaris ASICs when the iGPU is enabled. This prevents cursor allocations from landing at address 0. A MacBookPro11,5 with Radeon R9 M370X (VERDE) hits the same failure mode. Hardware cursor updates repeatedly log "DC: Cursor address is 0!" followed by "DC failed to set cursor attributes". Extend the existing workaround to CHIP_VERDE. With this change, hardware cursor operation is stable, the cursor errors remain at zero during repeated cursor movement, and cursor disappearance and flicker are no longer observed. Signed-off-by: Ayhan Çiçek --- drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c index 1bf2a42fa..9e7f9cc2b 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c @@ -1086,6 +1086,7 @@ void amdgpu_gmc_init_vga_resv_regions(struct amdgpu_device *adev) case CHIP_RENOIR: adev->mman.keep_stolen_vga_memory = true; break; + case CHIP_VERDE: case CHIP_POLARIS10: case CHIP_POLARIS11: case CHIP_POLARIS12: -- 2.55.0