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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [NVE7] changing resolution causes blank screen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=108615">108615</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[NVE7] changing resolution causes blank screen
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Driver/nouveau
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>nouveau@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jbytecoder@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>xorg-team@lists.x.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=142308" name="attach_142308" title="Xorg server log just after resolution switch">attachment 142308</a> <a href="attachment.cgi?id=142308&action=edit" title="Xorg server log just after resolution switch">[details]</a></span>
Xorg server log just after resolution switch

Using latest software ( linux-4.19.0, xf86-video-nouveau-1.0.15, mesa-18.2.3,
libdrm-2.4.96, xorg-server-1.20.3 ). When I try to change screen resolution
using xrandr to anything below native resolution the screen goes blank. To be
exact 
issuing xrandr -s 1024x768 causes the flowing:
1) screen turns completely black right away
2) after some time  ( no more that 500ms ), the screen changes to black with
backlight on. Looks a lot like no modesetting console without any content 
3) this situation persists, indefinitely

What is interesting is that switching to console works. The console just works.
However when I switch back to X, the above procedure repeats with one detail -
for a brief moment ( at the same moment as step 1) ) the content of desktop in
selected resolution is visible. It seems that the desktop content is somewhere
in memory but the driver decides to render some other area of memory

The only resolution to this problem that is working is to use older kernel,
linux-4.9.95 to be precise  

I discovered the issue, playing games through wine. But to isolate the cause I
gathered dmesg & xorg.log, running only an openbox and using xrandr to cause
the issue

I don't know what further info could be usefull</pre>
        </div>
      </p>


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