<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW ULT]eDP brightness is zero after the computer start"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70791">70791</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>[HSW ULT]eDP brightness is zero after the computer start
</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>qingshuai.tian@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=88022" name="attach_88022" title="dmesg (its brightness can changed by the function keys)">attachment 88022</a> <a href="attachment.cgi?id=88022&action=edit" title="dmesg (its brightness can changed by the function keys)">[details]</a></span>
dmesg (its brightness can changed by the function keys)
System Environment:
--------------------------
Kernel: (drm-intel-next-queued)d538bbdfde34028b5c5b0ba92b3c2096c5afb82c
Author: Damien Lespiau <<a href="mailto:damien.lespiau@intel.com">damien.lespiau@intel.com</a>>
Date: Mon Oct 21 14:29:30 2013 +0100
Bug detailed description:
-----------------------------
Everytime when the computer boot up into operating system, its eDP monitor will
turn into black and its brightness is zero. But in the BIOS stage, the monitor
works well.
After the machine boot up, we can change the brightness with the function
keys(Fn+F11),or we can also change the value of brightness in file
(/sys/class/backlight/intel_backlight/brightness) .Then the monitor will work
normally.
But sometime the function keys doesn't work, and I can't find the
file(/sys/class/backlight/intel_backlight/brightness). This occured once out of
every two times.
Reproduce steps:
-----------------------------
1.boot up the machine
2.cat /sys/class/backlight/intel_backlight/brightness</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>