<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - no resolutions >=1080p with Acer P7500 and Thinkpad X1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99362">99362</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>no resolutions >=1080p with Acer P7500 and Thinkpad X1
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>m.heide@tarent.de
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Hardware: Thinkpad X1 1294-2NG and Acer P7500 (projector)
With Ubuntu 14.04 everything is fine.
Updating to Ubuntu 16.04 and by default the connected projector says: no
signal. With other external monitors everything is fine, it's just the
projector which doesn't like the default resolution 1080p.
Using lower resolutions and/or timings like 1024x768 or 1920x1080i (25Hz,
interlaced 50Hz) everything is fine.
I tried several modelines and all manually calculated modelines like with gtf
or other tools do not work even on Ubuntu 14.04. It's just the default
recognized (DDC?) modeline with Kernels <=4.2 that work.
Using Ubuntu 16.04 i tried different kernels:
successfully:
* all official kernels coming with Ubuntu 14.04
(i.e. using kernel 3.19 with Ubuntu 16.04 works)
* from <a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/">http://kernel.ubuntu.com/~kernel-ppa/mainline/</a>
- v4.2.8-ckt13
- v4.3-rc1 with drivers/gpu/drm/i915 directory from v4.2.8-ckt13
* from git clone git://anongit.freedesktop.org/git/drm-tip
- git checkout f8896f5d58e64bfd3c2b5f7c5ba5c3f3967e93c7
broken:
* all official kernels coming with Ubuntu 16.04
(i.e. using kernel 4.4 with Ubuntu 14.04 doesn't work)
* from <a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/">http://kernel.ubuntu.com/~kernel-ppa/mainline/</a>
- v4.3-rc1 unmodified
* from git clone git://anongit.freedesktop.org/git/drm-tip
- git checkout ca6e4405779ed56ebac941570615abd667c72c02
So I think the regression must be added between
f8896f5d58e64bfd3c2b5f7c5ba5c3f3967e93c7 and
ca6e4405779ed56ebac941570615abd667c72c02.
I.e. between DRIVER_DATE 20150522 and 20150731.
(I've copied the i915-directory from Kernel v4.2.8-ckt13 to Kernel v4.3-rc1,
fixed some incompatibilities to successfully compile the kernel and this works.
So it's something inside i915 which causes this behaviour.)
Still digging further into it...</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>