[Bug 77351] [855GM] Mouse cursors show wrong default black cursors and/or do not update correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77351

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
The log behaves as I expect. The change of cursors is being sent to the kernel,
but you observe that the updates do not occur.

Can you please try this kernel patch:

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 764467e..efcfd53 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5055,6 +5055,7 @@ i915_gem_phys_pwrite(struct drm_device *dev,
                        return -EFAULT;
        }

+       drm_clflush_virt_range(vaddr, args->size);
        i915_gem_chipset_flush(dev);
        return 0;
 }

The other thing may be the two CRTCs using the same physical address. It's not
prohibited by the spec, but it may just be upsetting the hw?

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