Thanks, that approach makes sense and looks cleaner than handling individual ASICs. I'll test the attached generic patch on the affected MacBookPro11,5 with the Radeon R9 M370X (VERDE), with the hardware cursor enabled. I'll verify that the original symptoms do not return and that the kernel no longer reports: DC: Cursor address is 0! DC failed to set cursor attributes I'll report back with the test results and add my Tested-by if everything works as expected. Thanks, Ayhan
Alex Deucher <[email protected]>, 25 Eyl 2026 Cum, 16:19 tarihinde şunu yazdı: > On Fri, Sep 25, 2026 at 3:46 AM Ayhan Çiçek <[email protected]> wrote: > > > > 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. > > Sounds like this may be consistent for most or all Macs. How about > something like the attached patch? > > Alex > > > > > Signed-off-by: Ayhan Çiçek <[email protected]> > > --- > > 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 > > > -- Ayhan ÇİÇEK Software Architect +90 532 291 21 62 http://www.ayhancicek.com
