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<th>Priority</th>
<td>medium
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</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SNA/Gen4 xrandr mangles the screen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=63636">63636</a>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Summary</th>
<td>SNA/Gen4 xrandr mangles the screen
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>All
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<th>Reporter</th>
<td>sergio.callegari@gmail.com
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>git
</td>
</tr>
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<th>Component</th>
<td>Driver/intel
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<th>Product</th>
<td>xorg
</td>
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<pre>Hi,
there is an issue that causes 100% reproducible screen mangling of the screen
on Gen4 hardware, using sna.
I see it on a machine with displayport. Attaching the exernal screen and
running
xrandr --output DP1 --auto --primary --output LVDS1 --off
is sufficient to mangle the whole screen. I do not know if this also happens
with VGA screens (i.e. without displayport), but I suspect it is the case.
Note that after having corrupted the screen with the command above, you succeed
in blindly writing
xrandr --output LVDS1 --auto --primary --output DP1 --off
then screen is restored.
Also note that you can make the problematic command work fine, if you split it
in two steps
xrandr --output DP1 --primary --auto --output LVDS1 --auto --right-of DP1
xrandr --output DP1 --auto --primary --output LVDS1 --off
Thanks for the attention!</pre>
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