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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 - [GTK] WebKit 2.14.5 - flickering using pdf plugin"
   href="https://bugs.webkit.org/show_bug.cgi?id=169116">169116</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[GTK] WebKit 2.14.5 - flickering using pdf plugin
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>WebKit Gtk
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>oldregdata&#64;km.ru
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bugs-noreply&#64;webkitgtk.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Was first reported at <a href="https://bugzilla.gnome.org/show_bug.cgi?id=779505">https://bugzilla.gnome.org/show_bug.cgi?id=779505</a>
Opening pdf files in Epiphany Powered by WebKit 2.14.5 results in flickering. running Epiphany with the environment variable WEBKIT_DISABLE_COMPOSITING_MODE=1 or the environment variable WEBKIT_FORCE_COMPOSITING_MODE=1 doesn't seem to change this. 

uname -a: 
Linux a17030302 4.9.11-1-ARCH #1 SMP PREEMPT Sun Feb 19 13:45:52 UTC 2017 x86_64 GNU/Linux

Versions:

webkit2gtk 2.14.5-1
Web 3.22.6
GNOME Document Viewer 3.22.1

lspci | grep VGA:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)

Will be glad to provide further info!
Best wishes,</pre>
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