<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><span class="vcard"><a class="email" href="mailto:martin.x.andersen@gmail.com" title="Martin Andersen <martin.x.andersen@gmail.com>"> <span class="fn">Martin Andersen</span></a>
</span> changed
<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91434">bug 91434</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>NEEDINFO
</td>
<td>ASSIGNED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91434#c34">Comment # 34</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91434">bug 91434</a>
from <span class="vcard"><a class="email" href="mailto:martin.x.andersen@gmail.com" title="Martin Andersen <martin.x.andersen@gmail.com>"> <span class="fn">Martin Andersen</span></a>
</span></b>
<pre>There is no DP-HDMI dongle involved. The output is fed directly from a MacBook
Retina system via full-size/regular HDMI cable. (Yes, I've also noticed it says
DP.)
However; the exact same setup works 100% correctly with older kernels, as
outlined earlier in the ticket. By 100% i mean: never any picture dropouts,
never any dots (which only were seen with this most recent kernel) or other
graphical glitches.
The main production system (on IVB) currently runs 3.18.5; it behaves the same
with all recent kernel branches also.
I did quite a bit of testing earlier, on two Haswell-based systems and one Ivy
Bridge, with kernels ranging from 4.0.9, 4.8.1, 4.11.0 and most recently
4.12.0. They all exhibit consistent behaviour->none work correctly with
dual-display under any recent kernel.
Bear in mind that the unstable picture reported with this kernel from Jun 17th
2017 was *not* an issue with the prior ones, where it produced a stable 50&60Hz
picture (but no 23.976 or 24.000Hz (hence the title of this bug report) - which
led me to believe someone excplictly tried to fix the film modes between 4.11 &
4.12), but breaking the others in the process (for dual-screen setups).
I have three other sources hooked up to this projector, and none have issues.
The same behaviour is seen when hooked up directly to either of the projector's
two HDMI ports - with another cable - as well. So I believe 'cabling issues'
can be ruled out.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>