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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [HSW/IVB] Blank screen after resume with HSW"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101865#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [HSW/IVB] Blank screen after resume with HSW"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101865">bug 101865</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to nutrinfnon from <a href="show_bug.cgi?id=101865#c12">comment #12</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=135095" name="attach_135095" title="test 4.14.0-rc6">attachment 135095</a> <a href="attachment.cgi?id=135095&action=edit" title="test 4.14.0-rc6">[details]</a></span>
> test 4.14.0-rc6
>
> Hello,
>
> among the latest S3/S4 patches are:
>
> 2017-10-04 drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct
> drm_i915_private *dev_priv, bool resume
>
> /* 6. Enable DBUF */
> gen9_dbuf_enable(dev_priv);
> +
> + if (resume && dev_priv->csr.dmc_payload)
> + intel_csr_load_program(dev_priv);
> }
> 2017-10-04 drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 7933d1b..3791c3f 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct
> drm_i915_private *dev_priv, bool resume
>
> /* 6. Enable DBUF */
> gen9_dbuf_enable(dev_priv);
> +
> + if (resume && dev_priv->csr.dmc_payload)
> + intel_csr_load_program(dev_priv);
> }
>
>
> These patches are already merged in linux-4.14.0-rc6, so I tried it.
>
> My test with 4.14.0-rc6 still shows the presence of the problem, blank
> screen after resume.</span >
No surprise there, given that the the above changes are only relevant for
Cannonlake.</pre>
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