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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Radeon Trinity 7400G fails with 4K UHD screen - atombios stuck exeuting BF64"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91197">91197</a>
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<th>Summary</th>
<td>Radeon Trinity 7400G fails with 4K UHD screen - atombios stuck exeuting BF64
</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>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (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/Radeon
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>dennis.jansen@web.de
</td>
</tr></table>
<p>
<div>
<pre>I have several issues trying to connect a 4k display to the radeon card via
HDMI (@30Hz). If I boot with the screen connected, when trying to take over
modesetting from EFI, the internal notebook display goes black as well as the
external.
When I try to attach it during runtime, I can see the 3840 mode, but when I
tryt to select it I get
[ 97.667521] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for
more than 5secs aborting
[ 97.667549] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck
executing BF64 (len 962, WS 0, PS 0) @ 0xC1A1
Switching back to 1920 works fine, trying again simply causes the same error
again. Tested Linux kernels 4.1.0 and 3.19. Ubuntu 15.04.
I might not be able to test for long, will probably send the screen back before
long if I can't get it working in full resolution at all.</pre>
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