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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_NEW "
title="NEW - [SKL] External screen not recognized on boot, disconnects during operation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99334">bug 99334</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>display/DP
</td>
<td>display/HDMI
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] External screen not recognized on boot, disconnects during operation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99334#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] External screen not recognized on boot, disconnects during operation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99334">bug 99334</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>Jan 09 20:09:34 r-schwarzschild kernel: [drm:intel_hdmi_detect [i915]]
[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:34 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode adaptor ID: a0 (err 0)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:intel_hdmi_set_edid [i915]] DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)
Jan 09 20:09:34 r-schwarzschild kernel: [drm:i915_hotplug_work_func [i915]]
[CONNECTOR:59:HDMI-A-1] status updated from disconnected to connected
So there we were able to read the EDID.
[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:42 r-schwarzschild kernel: [drm:intel_hdmi_detect [i915]]
[CONNECTOR:59:HDMI-A-1]
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK for addr: 0050 w(1)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK on first message, retry
Jan 09 20:09:42 r-schwarzschild kernel: [drm:gmbus_xfer [i915]] GMBUS [i915
gmbus dpb] NAK for addr: 0050 w(1)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_do_probe_ddc_edid [drm]] drm:
skipping non-existent adapter i915 gmbus dpb
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] DP dual mode adaptor ID: a0 (err 0)
Jan 09 20:09:42 r-schwarzschild kernel: [drm:intel_hdmi_set_edid [i915]] DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)
Jan 09 20:09:42 r-schwarzschild kernel:
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:59:HDMI-A-1] status updated from connected to disconnected
Jan 09 20:09:42 r-schwarzschild kernel:
[drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:59:HDMI-A-1] disconnected
but here a bit later we are again unable to read it. It's quite weird since the
i2c bus seems to be fine itself since we can detect the DP dual mode chip
present on the bus. My only theory is that the dual mode chip is somehow going
crazy and preventing the i2c access for the EDID read from reaching the actual
display.</pre>
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