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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - HDMI not working on Skylake with EDID read error"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109273">109273</a>
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<th>Summary</th>
<td>HDMI not working on Skylake with EDID read error
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>glogow@fbihome.de
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=143056" name="attach_143056" title="Boot of E756 with HDMI failure.">attachment 143056</a> <a href="attachment.cgi?id=143056&action=edit" title="Boot of E756 with HDMI failure.">[details]</a></span>
Boot of E756 with HDMI failure.
I have two Skylake based laptops with build-in DP and HDMI output / adapters.
DP works fine on both, but one of them doesn't work with HDMI connections.
The working one is a Fujitsu U757 with, according to intel_hdmi_set_edid, a "DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)".
The broken one is a Fujitsu E756 with a "DP dual mode adaptor (type 1 HDMI)
detected (max TMDS clock: 165000 kHz)".
The attached logs are from an Ubuntu 4.20 vanilla build.
The attached the snipped shows the U757 when the HDMI-attached monitor is
correctly detected.
The other log is a full boot log with attach and unplug from the broken E756,
minus all the drm:drm_mode_addfb2 calls:
[ 109.680992] …
[drm:intel_hdmi_detect [i915]] [CONNECTOR:84:HDMI-A-1]
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
[drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus
dpb
[drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed, retry using GPIO
bit-banging
[drm:intel_gmbus_force_bit [i915]] enabling bit-banging on i915 gmbus dpb.
force bit now 1
[drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus
dpb
[drm:intel_gmbus_force_bit [i915]] disabling bit-banging on i915 gmbus dpb.
force bit now 0
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI
ADAPTOR\004 (err 0)
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode adaptor ID: ff (err
0)
[drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1 HDMI) detected
(max TMDS clock: 165000 kHz)
There were some people claiming broken Intel-HDMI when upgrading from Ubuntu
17.10 to 18.04. So I tried various vanilla Ubuntu kernel builds, with
approximately match Ubuntu released builds, minus some patches:
* 4.20.0-042000-generic
* 4.15.0-39-generic (18.04)
* 4.13.16-041316-generic (17.10)
* 4.4.169-0404169-generic (16.04)
None of them worked for me. Even tried Intel instead of modeset, but that
didn't help too. And I even tried with nomodeset kernel parameter, which didn't
work at all.</pre>
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