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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97965#c27">Comment # 27</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97965">bug 97965</a>
from <span class="vcard"><a class="email" href="mailto:ykku16dev2@gmail.com" title="Yu Kang Ku <ykku16dev2@gmail.com>"> <span class="fn">Yu Kang Ku</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=127130" name="attach_127130" title="Output of intel_watermark with trickle feed">attachment 127130</a> <a href="attachment.cgi?id=127130&action=edit" title="Output of intel_watermark with trickle feed">[details]</a></span>
Output of intel_watermark with trickle feed
(In reply to Ville Syrjala from <a href="show_bug.cgi?id=97965#c25">comment #25</a>, part 2)
<span class="quote">> Another thing you could try is enable trickle feed. That shouldn't change
> much though as it's essentially just always forcing the watermarks to 8 or
> something like that. But worth a shot anyway I suppose:
>
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -1070,7 +1070,7 @@ static void vlv_init_display_clock_gating(struct
> drm_i915_private *dev_priv)
> /*
> * Disable trickle feed and enable pnd deadline calculation
> */
> - I915_WRITE(MI_ARB_VLV, MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE);
> + I915_WRITE(MI_ARB_VLV, 0);
> I915_WRITE(CBR1_VLV, 0);
>
> WARN_ON(dev_priv->rawclk_freq == 0);</span >
I repeated the dock-mode experiment, adding this trickle-feed change along with
the PM2-limit change. The trickle-feed change did not help. The problem is
still reproducible. Attached is the output of intel_watermark showing that the
trickle change took effect.</pre>
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