Can you try:
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/inte
index 041f144..8e632a5 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -928,6 +928,10 @@ int intel_init_ring_buffer(struct drm_device *dev,
if (ret)
goto err_unref;
+ ret = i915_gem_object_set_to_gtt_domain(obj, true);
+ if (ret)
+ goto err_unpin;
+
ring->map.size = ring->size;
ring->map.offset = dev->agp->base + obj->gtt_offset;
ring->map.type = 0;
--
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https://bugs.launchpad.net/bugs/850939
Title:
[i965gm] GPU lockup EIR:0x00000010, followed by PLL state assertion
failure
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