[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

--- Comment #26 from Yu Kang Ku <ykku16dev2 at gmail.com> ---
Created attachment 127126
  --> https://bugs.freedesktop.org/attachment.cgi?id=127126&action=edit
Output of intel_watermark with PM2 limit

(In reply to Ville Syrjala from comment #25)
> That's not a bit too different since it's gone and enabled PM5 and DDR DVFS.
> So you should limit it to PM2 to make sure we're doing apples to apples
> comparison.
> Eg.:
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -946,7 +946,7 @@ static void vlv_setup_wm_latency(struct drm_device *dev)
>  
>         dev_priv->wm.max_level = VLV_WM_LEVEL_PM2;
>  
> -       if (IS_CHERRYVIEW(dev_priv)) {
> +       if (0 && IS_CHERRYVIEW(dev_priv)) {
>                 dev_priv->wm.pri_latency[VLV_WM_LEVEL_PM5] = 12;
>                 dev_priv->wm.pri_latency[VLV_WM_LEVEL_DDR_DVFS] = 33;
> 
> 

I applied this change and repeated the dock-mode experiment.  The problem is
still reproducible.  Attached is the output of intel_watermark showing that
your change took effect.

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