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<body><span class="vcard"><a class="email" href="mailto:eich@pdx.freedesktop.org" title="Egbert Eich <eich@pdx.freedesktop.org>"> <span class="fn">Egbert Eich</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT] No HDMI hotplugging"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89008">bug 89008</a>
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<th>What</th>
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<td>eich@pdx.freedesktop.org, imre.deak@intel.com, ville.syrjala@linux.intel.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT] No HDMI hotplugging"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89008#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BYT] No HDMI hotplugging"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89008">bug 89008</a>
from <span class="vcard"><a class="email" href="mailto:eich@pdx.freedesktop.org" title="Egbert Eich <eich@pdx.freedesktop.org>"> <span class="fn">Egbert Eich</span></a>
</span></b>
<pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=89008#c8">comment #8</a>)
<span class="quote">> Ville on #intel-gfx:
>
> 22:40 vsyrjala j4ni: hotplug needs disp2d well on byt. if there
> are
> no active display we turn off the power well. also
> most display regs are in the power well which
> explains
> the 0xffffffff</span >
Indeed, I was able to bisect this back to commit
77961eb984c7e5394bd29cc7be2ab0bf0cc7e7b1.
This begs the question if the disp2d power wells need to be disabled quite as
aggressively: maybe there is only a subset needed for hotplug which can stay
enabled.
The same is true for the display interrupts: HPD may be one of them.
I do understand that it is important to power down the chip as much as possible
whenever feasable for ultra mobile use cases. However a lot of Baytrail chips
are used in TCs or other desktop like devices which are connected to the mains
- at least my system with 8086:0f31 is.</pre>
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