<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB DP] FIFO underrun when trying to set a high display mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85621#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB DP] FIFO underrun when trying to set a high display mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85621">bug 85621</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>Your dotclock (419.5 MHz) exceeds the core display clock (cdclk) which is 400
MHz on IVB. That means IVB simply can't support this mode as it can't produce
pixels fast enough.
Unfortunately we lack the necessary checks to reject the mode outright. I've
been working on some stuff that should make that possible in the not so distant
future. I'll report back when I have something that can be tested.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>