I'm running 3.0 + the patch below without problems. Not sure which
upstream commit that was! Sorry, I havent have time to play with it
once i got things working. :)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 0f1c799..4ed1ca5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1606,6 +1606,8 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc,
unsigned long interval)
I915_WRITE(SNB_DPFC_CTL_SA,
SNB_CPU_FENCE_ENABLE | dev_priv->cfb_fence);
I915_WRITE(DPFC_CPU_FENCE_OFFSET, crtc->y);
+ /* Set persistent mode */
+ I915_WRITE(ILK_DPFC_CONTROL, 1 << 25);
sandybridge_blit_fbc_update(dev);
}
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https://bugs.launchpad.net/bugs/790015
Title:
subtle graphics corruption after resume on sandybridge laptop
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