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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 - miniDP to external monitor with DVI-D via miniDP to HDMI/DVI-D/DP adapter : DP dual mode HDMI ID: (err -6) and blank screen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105891">105891</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>miniDP to external monitor with DVI-D via miniDP to HDMI/DVI-D/DP adapter : DP dual mode HDMI ID: (err -6) and blank screen
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>genpur@o2.pl
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=138602" name="attach_138602" title="dmesg_kernel-4.13.0-38-generic.log">attachment 138602</a> <a href="attachment.cgi?id=138602&action=edit" title="dmesg_kernel-4.13.0-38-generic.log">[details]</a></span>
dmesg_kernel-4.13.0-38-generic.log
Overview :
Connection from miniDP port (Intel HD Graphics 3000) to DVI-D input of external
monitor (iiyama ProLite E1900S) via miniDP to HDMI/DVI/DP adapter (LogiLink
CV0045A).
Laptop specification:
Dell XPS L502x with Optimus combo
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 525M]
(rev ff)
Operating system:
Lubuntu 17.10 64-bit with latest kernels :
a) 4.13.0-38-generic - from official ubuntu repositories (sudo apt-get
dist-upgrade)
b) 4.16.0-041600-generic - from
<a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16/">http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16/</a>
Steps to Reproduce:
1) connect like described above in overview
2a) start laptop with kernel (4.13.0-38-generic) with parameters :
drm.debug=14 video=HDMI-A-1:1280x1024-16@75D
drm_kms_helper.edid_firmware=HDMI-A-1:edid/monitor.bin
OR
2b) start laptop with kernel (4.16.0-041600-generic) with parameters :
drm.debug=14 video=HDMI-A-1:1280x1024-16@75D
drm.edid_firmware=HDMI-A-1:edid/monitor.bin
Actual Results:
1) Blank display of external monitor
2) error : [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID:
(err -6)
Expected Results:
Display activated
Additional Information:
When X server has started, I checked some parameters :
cat /sys/class/drm/card1-HDMI-A-1/enabled
enabled
cat /sys/class/drm/card1-HDMI-A-1/status
connected
cat /sys/class/drm/card1-HDMI-A-1/modes
1280x1024
1280x1024
1280x960
1152x864
1024x768
1024x768
1024x768
832x624
800x600
800x600
800x600
800x600
640x480
640x480
640x480
640x480
720x400
------
Before I tried to connect iiyama monitor, I have tried to connect Panasonic-TV
via the same adapter without any extra kernel parameters(just normal launch)
and TV was working correctly. I have got :
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI
ADAPTOR\004 (err 0)
instead of
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: (err -6)
This is only difference I saw, when display was activated (err 0) and not
activated (err -6).
I supposed that problem might be that EDID is not read corectly from iiyama
monitor via miniDP/HDMI adapter.
So, I saved EDID from this monitor when I have connected to another computer. I
saved EDID of Panasonic-TV, too. I verified both of them and checksum was
correct.
Next I have stored EDID into initramfs. I played with kernel parameters
(drm.edid_firmware=... , video=... ) on connection with Panasonic TV just to be
sure, that I'm using EDID builded-in initram. Display of Panasonic TV seems to
work according to those parameters.
Finally, I have connected iiyama monitor and I tried to force state "on" of
HDMI-A-1 connector but display was not activated.</pre>
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