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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GLK] Blank screen with Acer S277HK monitor at 12bpc 2560x1440@60"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101059">101059</a>
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<th>Summary</th>
<td>[GLK] Blank screen with Acer S277HK monitor at 12bpc 2560x1440@60
</td>
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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>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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
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<th>Reporter</th>
<td>conselvan2@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>This was initially discussed in <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [GLK] [IGT] testdisplay -a shows corruption on HDMI 4k display"
href="show_bug.cgi?id=100440">bug #100440</a>, which tracked a different issue.
Attempting to enable the 2560x1440 mode with 12 bpc in an Acer S277HK monitor
leads to a blank screen.
from <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [GLK] [IGT] testdisplay -a shows corruption on HDMI 4k display"
href="show_bug.cgi?id=100440#c19">bug 100440, comment 19</a>
<span class="quote">> I also tested enabling the given mode with only scrambling and only high
> tmds.
>
> scrambling high tmds result
> yes yes fail
> yes no pass
> no yes fail
> no no pass
>
> So this seems to be a combination of 12 bpc, a port clock in the range
> [340,405) and high tmds ratios. But as far as I can tell, we are following
> the spec with respect to those. Shashank, any ideas?</span >
from <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [GLK] [IGT] testdisplay -a shows corruption on HDMI 4k display"
href="show_bug.cgi?id=100440">bug 100440</a>, commend 32
<span class="quote">> I was able to get this issue tested with a HDMI analyzer too.
> Here are the updates:</span >
...
<span class="quote">> - The display never fails when using the analyzer. It only fails using real
> monitor.
> - Scrambling and clock high ratio is getting enabled/set/disabled properly.
> - Bootup and modeset dmesg logs attached.
>
> I think this is a fault with monitor, which is not able to handle this mode
> at 12BPC (Also, This mode is a non-CEA modes, so not a standard one too)</span ></pre>
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</p>
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