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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Kernel 4.16.0+ switch amdgpu.dc=1 causes screen brightness set to 1 to be dimmed by default"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106006">106006</a>
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<th>Summary</th>
<td>Kernel 4.16.0+ switch amdgpu.dc=1 causes screen brightness set to 1 to be dimmed by default
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sass.joel@gmail.com
</td>
</tr></table>
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<pre>I'm noticing that the default screen brightness of my desktop when logged in is
set to something beneath "1" when set to "1" with amdgpu.dc=1 switch in the
kernel.
Test to get to this point:
* boot PC - (Grub screen brightness is "normal")
* Set kernel value amdgpu.dc=1 and proceed with 4.16.0+ kernel boot - (kernel
switches quiet and splash removed, brightness appears normal during boot
process)
* Lightdm display manager starts (brightness is still "normal")
* Log in to any window manager, When X starts, the desktop is immediately
darkened with what appears to be a high contrast setting. Looks like equivalent
to manual setting I can't actually discern. It's not brightness, necessarily,
but the net effect on the desktop is that everything is effectively darker.
* I've tested this with Ubuntu's Unity desktop, and gnome-flashback (compiz and
metacity), and it behaves the same.
When amdgpu.dc=0 is set, desktop appears a normal level of brightness when
logging in. It appears from the Xorg.0.log that the AMDGPU module isn't used
for X, but brightness isn't affected.
I'll include logs from amdgpu.dc=0 and amdgpu.dc=1. Let me know if you need any
other logs.</pre>
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