[Bug 97965] [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97965

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #17 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Hmm. Even though the cursor wasn't probably a factor, let's try and make sure
by setting a tight watermark for it even when it's disabled:

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7f1748a1e614..92611d6aaea3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -965,6 +965,9 @@ static uint16_t vlv_compute_wm_level(struct intel_plane
*plane,
        if (dev_priv->wm.pri_latency[level] == 0)
                return USHRT_MAX;

+       if (plane->base.type == DRM_PLANE_TYPE_CURSOR)
+               return 63;
+
        if (!state->base.visible)
                return 0;


Another interesting thing we could check is whether the problem happens when
the primary display is using pipe B as opposed to pipe A. The hardware has some
warts where the pipes have some invalid linkages between them, so by using
another pipe for the primary display we might be able to avoid some of them.
So something like 'xrandr --output eDP1 --crtc 1' should do it.

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