It seems that writing DSPSURF in intel_flush_display_plane() causes
the blank screen on some old laptops like Dell D630 with 965GM.
Since this operation is needed only for ILK+, make it conditional.
Cc: <stable at kernel.org> [v3.1+]
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
drivers/gpu/drm/i915/intel_display.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1379,7 +1379,8 @@ static void intel_flush_display_plane(st
enum plane plane)
{
I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
- I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
+ if (dev_priv->info->gen >= 5)
+ I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
}
/**
