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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - amd-staging-4.7: problems with unblanking displays when monitors are switched off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98324">98324</a>
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<th>Summary</th>
<td>amd-staging-4.7: problems with unblanking displays when monitors are switched off
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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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/AMDgpu
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>bugspam@moreofthesa.me.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=127405" name="attach_127405" title="Kernel log extract, showing the unblanking failure.">attachment 127405</a> <a href="attachment.cgi?id=127405&action=edit" title="Kernel log extract, showing the unblanking failure.">[details]</a></span>
Kernel log extract, showing the unblanking failure.
Setup: RX 470 with two monitors attached – one via DVI-and one via HDMI. (Both
are AOC monitors.)
* Ensure that outputs are blanked (via xset, time-out or similar).
* Switch off the monitors.
* Unblank the outputs.
* Switch on the monitors.
Invariably, in this situation, the DVI-connected monitor is unblanked and
displaying what it should be, but the HDMI-connected monitor is receiving no
signal (or at least nothing to display) and is therefore displaying nothing.
The HDMI-connected monitor can be restored by using xrandr to change mode or by
blanking and unblanking – so long as it's switched on while doing so.</pre>
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