From 0502ecec1ea91a205a0e7208334001f30664b526 Mon Sep 17 00:00:00 2001 From: Fedora Kernel Team Date: Mon, 20 Jun 2016 14:52:10 +0200 Subject: [PATCH] i915/fbc: Disable on HSW by default for now Upstream: posted on dri-devel (and r-b'd) Author: cpaul@redhat.com AuthorDate: Thu Jun 9 11:58:15 2016 -0400 Commit: Rob Clark CommitDate: Thu Jun 9 15:43:07 2016 -0400 i915/fbc: Disable on HSW by default for now >From https://bugs.freedesktop.org/show_bug.cgi?id=96461 : This was kind of a difficult bug to track down. If you're using a Haswell system running GNOME and you have fbc completely enabled and working, playing videos can result in video artifacts. Steps to reproduce: - Run GNOME - Ensure FBC is enabled and active - Download a movie, I used the ogg version of Big Buck Bunny for this - Run `gst-launch-1.0 filesrc location='some_movie.ogg' ! decodebin ! glimagesink` in a terminal - Watch for about over a minute, you'll see small horizontal lines go down the screen. For the time being, disable FBC for Haswell by default. Signed-off-by: Lyude Reviewed-by: Paulo Zanoni Cc: stable@vger.kernel.org --- drivers/gpu/drm/i915/intel_fbc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c index d5a7cfe..647127f 100644 --- a/drivers/gpu/drm/i915/intel_fbc.c +++ b/drivers/gpu/drm/i915/intel_fbc.c @@ -824,8 +824,7 @@ static bool intel_fbc_can_choose(struct intel_crtc *crtc) { struct drm_i915_private *dev_priv = crtc->base.dev->dev_private; struct intel_fbc *fbc = &dev_priv->fbc; - bool enable_by_default = IS_HASWELL(dev_priv) || - IS_BROADWELL(dev_priv); + bool enable_by_default = IS_BROADWELL(dev_priv); if (intel_vgpu_active(dev_priv->dev)) { fbc->no_fbc_reason = "VGPU is active"; -- 2.7.4