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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [radeon] sumo2 locks up and fails to train displayport during boot (panel turns off)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96527#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [radeon] sumo2 locks up and fails to train displayport during boot (panel turns off)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96527">bug 96527</a>
from <span class="vcard"><a class="email" href="mailto:alexdeucher@gmail.com" title="Alex Deucher <alexdeucher@gmail.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>It looks like a GPU hang. I think the displayport failure is just a side
effect of that. Does it work if you disable acceleration in X? To disable
acceleration, add an /etc/X11/xorg.conf file with the following content:
Section "Device"
Identifier "Device0"
Driver "radeon"
Option "NoAccel" "true"
EndSection</pre>
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