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<body><span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89419">bug 89419</a>
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<td>tiwai@suse.de
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89419#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89419">bug 89419</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>(In reply to jinliangx.wang from <a href="show_bug.cgi?id=89419#c13">comment #13</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=114575" name="attach_114575" title="dmesg with patch applied">attachment 114575</a> <a href="attachment.cgi?id=114575&action=edit" title="dmesg with patch applied">[details]</a></span>
> dmesg with patch applied</span >
Thanks.
I think there are multiple issues here, one is that the audio driver didn't ask
for its power well, this is fixed by the patch in <a href="show_bug.cgi?id=89419#c7">comment 7</a>. The patch needs to
be updated since it will also make haswell_set_bclk program the EM4/5 registers
which are not existant on SKL.
Since the above fix is not enough, I assume that something needed by audio gets
reset when turning off the audio power well and doesn't get reinitialized when
reenabling it.
Adding Takashi for any insight.</pre>
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