At long last, the time has finally come for Skylake users to plug their external displays back in. During intel_atomic_commit() on Skylake, we've actually been arming the registers to update the cursor information twice instead of just once. Once in i9xx_update_cursor(), and once in skl_wm_flush_pipe(). This isn't actually necessary, and removing the later update in skl_wm_flush_pipe() has completely stopped the underruns on this T460p from occurring when moving the mouse cursor from one monitor to another. Signed-off-by: Lyude <cpaul@xxxxxxxxxx> Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx> Cc: Hans de Goede <hdegoede@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx --- drivers/gpu/drm/i915/intel_pm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 7ac71ec..4771a03 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3860,7 +3860,6 @@ skl_wm_flush_pipe(struct drm_i915_private *dev_priv, enum pipe pipe, int pass) I915_WRITE(PLANE_SURF(pipe, plane), I915_READ(PLANE_SURF(pipe, plane))); } - I915_WRITE(CURBASE(pipe), I915_READ(CURBASE(pipe))); } static bool -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html