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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HD-4400]No native resolution 2560x1600 on Lenovo Onelink Pro DisplayPort and X1 Carbon 2014"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78507">78507</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HD-4400]No native resolution 2560x1600 on Lenovo Onelink Pro DisplayPort and X1 Carbon 2014
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>anewgene+freedesktop@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=98791" name="attach_98791" title="dmesg_debug_DP2.txt">attachment 98791</a> <a href="attachment.cgi?id=98791&action=edit" title="dmesg_debug_DP2.txt">[details]</a></span>
dmesg_debug_DP2.txt
Previous drm-intel-nightly kernel
(<a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2014-04-17-trusty/">http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2014-04-17-trusty/</a>)
solves the native resolution issue, but caused blank screen on built-in laptop
display. See <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HD-4400]upsteam kernel (drm-intel-nightly/2014-04-17-trusty) causes blank screen on lenovo X1 Carbon 2014."
href="show_bug.cgi?id=77660">bug 77660</a>.
The latest drm-intel-nightly kernel (3.15.0-994_3.15.0-994.201405080316) solves
the blank screen issue now, but I lose the native resolution 2560x1600 on
external display. It only support generic 1024x768 and 800x600 modes.
I can see many errors like this in dmesg log:
[ 6.433670] [drm:drm_dp_i2c_do_msg] I2C defer
[ 6.434177] [drm:drm_dp_i2c_do_msg] too many retries, giving up
I attached full dmesg log with drm.debug=0xe.
It's very tricky that, occasionally, it does work fine, but most of time, it's
not. I tried booting into Windows 8, it never had the issue.
System environment:
-- chipset: intel i7-4600U (HD-4400)
-- system architecture: 64-bit
-- kernel: drm-intel-nightly kernel (3.15.0-994_3.15.0-994.201405080316)
-- Linux distribution: Ubuntu 14.04
-- xserver: 1.15.1
-- xserver-xorg-video-intel: 2:2.99.910-0ubuntu1
-- Machine or mobo model: Lenovo X1 Carbon 2014 (20A7CTO1WW)
-- Display connector: DisplayPort on OneLink Pro dock
-- Monitor: Dell U3011
Reproducing steps:
* install latest drm-intel-nightly upstream kernel
* boot with this kernel</pre>
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