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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 - AMDGPU Tonga only does 2560x1440 at 120hz, switching to 144hz causes display errors, same thing used to happen with fglrx."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=96868">96868</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>AMDGPU Tonga only does 2560x1440 at 120hz, switching to 144hz causes display errors, same thing used to happen with fglrx.
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>7.7 (2012.06)
          </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>major
          </td>
        </tr>

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

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

        <tr>
          <th>Assignee</th>
          <td>xorg-driver-ati@lists.x.org
          </td>
        </tr>

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

        <tr>
          <th>QA Contact</th>
          <td>xorg-team@lists.x.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Using the opensource AMDgpu driver with an AMD R9 380 on a Benq XL2730Z causes
major display corruption when set to native resolution and a 144hz refresh
rate.

The same problem used to occur with fglrx, but had been fixed recently.

On the, now working, fglrx system xvidtune shows the modeline:
"2560x1440"   586.00   2560 2568 2600 2640   1440 1465 1473 1543 +hsync -vsync

Running xvidtune on the AMDgpu system shows the exact same current modeline.
Only this time the screen flickers constantly and just the top ~13% of the
screen is somewhat visible, every line below is unstable, interlaced,
corrupted.

Setting the display to 120hz gives a modeline:
"2560x1440"   482.64   2560 2568 2600 2640   1440 1447 1455 1525 +hsync -vsync
And seems to work just fine. The same goes for 100 and 60Hz.</pre>
        </div>
      </p>


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