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    <body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO --- - [BYT]I-G-T/testdisplay && 1920x1080i showing half screen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=74964">bug 74964</a>
        <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>NEEDINFO
           </td>
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO --- - [BYT]I-G-T/testdisplay && 1920x1080i showing half screen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=74964#c7">Comment # 7</a>
              on <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO --- - [BYT]I-G-T/testdisplay && 1920x1080i showing half screen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=74964">bug 74964</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>A quick test would be to try:

diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index d5eafd1..d58966a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5333,7 +5333,7 @@ static void i9xx_set_pipeconf(struct intel_crtc
*intel_crtc)

        if (!IS_GEN2(dev) &&
            intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
-               pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
+               pipeconf |= PIPECONF_INTERLACE_W_SYNC_SHIFT_PANEL;
        else
                pipeconf |= PIPECONF_PROGRESSIVE;


(This is likely to regress HDMI though and !BYT - but we should also see a
similar bug on gm45.)</pre>
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