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<body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - No internal display on kernels > 4.4.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105406">bug 105406</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>REOPENED
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - No internal display on kernels > 4.4.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105406#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - No internal display on kernels > 4.4.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105406">bug 105406</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>[ 14.988821] [drm:intel_dp_read_dpcd [i915]] DPCD: 10 0a 82 40 00 00 01 00 02
00 00 00 10 01 00
means we were able to read the DPCD, and it has a valid revision number.
That leads me to suspect that the display might be saying that SINK_COUNT is
zero.
Please run this:
dd if=/dev/drm_dp_aux1 bs=1 skip=$((0x200)) count=1 2>/dev/null | xxd -p
Your kernel will need to be built with CONFIG_DRM_DP_AUX_CHARDEV=y for that to
work.</pre>
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