[PATCH 1/2] drm/i915: Revert wait for vblank to prevent X refresh issues

[Sitsofe Wheeler <sitsofe@yahoo.com>]

In commit 9d0498a2bf7455159b317f19531a3e5db2ecc9c4 20ms waits were
converted into vblank waits. One of these caused tearing, mode detection
and redraw issues on an EeePC 900 with a more recent intel userspace (
http://lkml.org/lkml/2010/8/23/432 ). Restoring the 20ms wait resolves
the issue.
---
 drivers/gpu/drm/i915/intel_display.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 23157e1..116d938 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4539,7 +4539,7 @@ struct drm_crtc *intel_get_load_detect_pipe(struct intel_encoder *intel_encoder,
 		encoder_funcs->commit(encoder);
 	}
 	/* let the connector get through one full cycle before testing */
-	intel_wait_for_vblank(dev, intel_crtc->pipe);
+	msleep(20);
 
 	return crtc;
 }
-- 
1.7.1