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<body><span class="vcard"><a class="email" href="mailto:graaskaeg.via.forwarder@neverbox.com" title="Pontus Gråskæg <graaskaeg.via.forwarder@neverbox.com>"> <span class="fn">Pontus Gråskæg</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - 4k hdmi monitor stays black on kaveri [regression]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107072">bug 107072</a>
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<td>graaskaeg.via.forwarder@neverbox.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - 4k hdmi monitor stays black on kaveri [regression]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107072#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - 4k hdmi monitor stays black on kaveri [regression]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107072">bug 107072</a>
from <span class="vcard"><a class="email" href="mailto:graaskaeg.via.forwarder@neverbox.com" title="Pontus Gråskæg <graaskaeg.via.forwarder@neverbox.com>"> <span class="fn">Pontus Gråskæg</span></a>
</span></b>
<pre>Looking at your dmesg output, it looks like you might have hit this bug/issue:
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [dc] No support for LVDS or VGA connectors (Cannot find any crtc or sizes)"
href="show_bug.cgi?id=105880">bug 105880</a>
"[dc] No support for LVDS or VGA connectors (Cannot find any crtc or sizes)"
AMD/Harry Wentland/Alex Deucher have commits in the mainline kernel to disable
the DC code by default for Bonaire, Kabini, Kaveri, and Mullins as certain
hardware interfaces are not supported in the DC code. Your cpu (from dmesg) is
an AMD A8-7650K Radeon R7, codename Kaveri.
The clue in dmesg output is the following errors:
[ 14.186318] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
ObjectID from Adapter Service for connector index:1! type 0 expected 3
[ 14.186458] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
ObjectID from Adapter Service for connector index:3! type 0 expected 3
[ 14.186592] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
ObjectID from Adapter Service for connector index:4! type 0 expected 3
[ 14.186725] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
ObjectID from Adapter Service for connector index:5! type 0 expected 3
You might try forcing amdgpu.dc=0 in the kernel command line to ensure you use
the old driver code.
graaskaeg</pre>
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