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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Skly Regression]Failed to power on power well 2 when no HDMI/DP monitor is connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91255#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [Skly Regression]Failed to power on power well 2 when no HDMI/DP monitor is connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91255">bug 91255</a>
from <span class="vcard"><a class="email" href="mailto:libin.yang@intel.com" title="Libin Yang <libin.yang@intel.com>"> <span class="fn">Libin Yang</span></a>
</span></b>
<pre>(In reply to Paulo Zanoni from <a href="show_bug.cgi?id=91255#c4">comment #4</a>)
<span class="quote">> Is the audio driver correctly calling i915_audio_component's get_power() and
> put_power()? Those functions are supposed to grab POWER_DOMAIN_AUDIO, which
> is supposed to turn on power well 2 on the graphics driver.</span >
Yes, the audio driver will call get_power()
The reproduce steps on SKL are:
1. bootup with HDMI monitor connected
2. disconnect the monitor
3. wait for several seconds. 5 seconds should be enough
4. run `cat /proc/asound/card0/codec#2
5. run `cat /proc/asound/card0/eld*
You will find the eld info and codec info are wrong. And when you run dmesg,
you will find the CSR firmware not ready error message.
BTW: we tested today latest kernel, it seems we can get the correct eld info,
but the CSR firmware not ready message still exists.</pre>
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