<html>
    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=107393">107393</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>4.18.0-rc6 amdgpu framebuffer problems with DisplayPort
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </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>DRM/AMDgpu
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>lkd-fdo@sky-haven.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=140848" name="attach_140848" title="combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in 4.18.0-rc6">attachment 140848</a> <a href="attachment.cgi?id=140848&action=edit" title="combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in 4.18.0-rc6">[details]</a></span>
combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in
4.18.0-rc6

On kernel 4.17.0, amdgpudrmfb functions correctly; taking the fb from efifb

On kernel 4.18.0-rc6 (and previous), the framebuffer proper doesn't start;
monitor doesn't get a valid display signal. If I log in and blind-start a
Wayland compositor (sway in my case), the display gets a desktop and things
work normally. Once I exit out back to FB, the display is blanked.

Everything works normally if I connect the monitor with HDMI instead.

This was a problem with 4.18.0-rc5 as well. I was pointed to the patch at
<a href="https://lists.freedesktop.org/archives/amd-gfx/2018-July/023920.html">https://lists.freedesktop.org/archives/amd-gfx/2018-July/023920.html</a> and
applied it to 4.18.0-rc5, but it had no effect on behavior.

GPU: Vega64
Monitor: Acer XR341CK</pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>