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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 --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73156">73156</a>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Summary</th>
<td>Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</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>daiver@daiver.ru
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=91333" name="attach_91333" title="intel_reg_dumper, lspci, xrandr, etc">attachment 91333</a> <a href="attachment.cgi?id=91333&action=edit" title="intel_reg_dumper, lspci, xrandr, etc">[details]</a></span>
intel_reg_dumper, lspci, xrandr, etc
Laptop: Asus Taichi 31 (same problem on Asus Taichi 21)
It has two embedded LCD.
Internal on eDP1 and external on DP1.
Start laptop with lid opened:
- external (DP1) screen backlight off
- internal (eDP1) screen backlight on
- change brighness work on internal
- cannot turn on external
- go to sleep and back, after internal screen backlight work
- lid_open* logs in attach (intel_reg_dumper, lspci, xrandr, etc)
Start laptop with lid closed:
- external (DP1) screen backlight on
- internal (eDP1) screen backlight off
- change brighness work on internal!
- if lid open internal screen turn on, and change backlight work, but no image
on it
- lid_closed_boot* logs in attach
- go to sleep and back, after external screen without backlight
- internal the same: there is backlight but no image
- lid_closed_sleep* logs in attach
test on 3.13-rc6 2013-12-30 same
I can get more info/compile/debug/test with your advice.</pre>
</div>
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