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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Regression] Internal backlight brightness initially set to 0 when external display is connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79581">79581</a>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
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<th>Summary</th>
<td>[Regression] Internal backlight brightness initially set to 0 when external display is connected
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Severity</th>
<td>major
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>michael.monreal+bugs@gmail.com
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>6.7.0
</td>
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<th>Component</th>
<td>Driver/intel
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<th>Product</th>
<td>xorg
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<pre>When I boot my laptop with "Intel(R) HD Graphics 4000" and my external display
connected via Mini DisplayPort (only connector), the brightness
(/sys/class/backlight/intel_backlight/brightness) of the internal screen is set
to 0 each time the X server is started:
a) After boot, GDM starts and the internal screen turns black. I can still log
in blindly. I can also go to a VT and back (ctrl-alt-f2, alt-f1) and the
brightness will be fine.
b) When GNOME starts (new X server I suppose?) the same thing happens again.
Going to a VT and back does NOT work around the problem, I need to do something
like "echo 4000 > /sys/class/backlight/intel_backlight/brightness" or try to
navigate to the brightness control manually.
This is on Fedora 20 with the following packages:
- xorg-x11-drv-intel-2.21.15-5.fc20.x86_64
- kernel-3.14.4-200.fc20.x86_64
I can also reproduce this 100% on the Fedora 20 live CD, which has:
- xorg-x11-drv-intel-2.21.15-5.fc20.x86_64
- kernel-3.11.10-301.fc20.x86_64
This is a regression from Fedora 19, where it used to work fine. I just
verified again and the problem does not show onf the Fedora 19 live CD, which
has:
- xorg-x11-drv-intel-2.21.8-1.fc19.x86_64
- kernel-3.9.5-301.fc19.x86_64
If there is anything else I can provide please ask me.</pre>
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