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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 - GeminiLake HDMI hotplug between 4K@60 and 4K@30 monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105655">105655</a>
</td>
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<th>Summary</th>
<td>GeminiLake HDMI hotplug between 4K@60 and 4K@30 monitors
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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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
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>antonychen@qnap.com
</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>
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<p>
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<pre>Environment:
Mainboard: Intel RVB
BIOS: AMI
OS: Ubuntu 17.10
Monitors: ViewSonic VP2780-4K (A), ASUS PB287Q (B)
TV: LG 49UJ630T (C)
A and C support 4K@60, B support 4K@30
My steps:
1. Plug A or C and bootup
2. After OS finishes booting, unplug HDMI cable in console mode
Then dmesg shows the error messages:
[drm:drm_scdc_set_high_tmds_clock_ratio [drm_kms_helper]] *ERROR* Failed to
read TMDS config: -6
[drm:intel_hdmi_handle_sink_scrambling [i915]] *ERROR* Set TMDS ratio failed
3. Plug B
Then there is not signal to B, and dmesg shows the error messages above again.
4. Unplug B and Plug A or C, then A or C display normally.
I also do some tests when I start X:
1. Plug A and bootup
2. sudo xinit
3. unplug HDMI cable and plug B, there is not signal to B
4. xrandr --output HDMI1 --off
Then dmesg shows the error messages:
[drm:drm_scdc_set_high_tmds_clock_ratio [drm_kms_helper]] *ERROR* Failed to
read TMDS config: -6
[drm:intel_hdmi_handle_sink_scrambling [i915]] *ERROR* Set TMDS ratio failed
5. xrandr --output HDMI1 --auto
Then there is not signal to B, and dmesg shows the error messages above again.
In the second testing, if I use C to replace A, then there IS signal to B in
the 5th step.</pre>
</div>
</p>
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