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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [VLV, backlight] Backlight Brighness not linear"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94813">94813</a>
</td>
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<th>Summary</th>
<td>[VLV, backlight] Backlight Brighness not linear
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>eich@pdx.freedesktop.org
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>f.de.kruijf@gmail.com, intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>i915 platform</th>
<td>BYT
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=122698" name="attach_122698" title="kernel log w drm.debug=0x6">attachment 122698</a> <a href="attachment.cgi?id=122698&action=edit" title="kernel log w drm.debug=0x6">[details]</a></span>
kernel log w drm.debug=0x6
We've received a report that the backlight brightness behaves non-linear on a
VLV
(PCI DevID: 0x0f31) with kernel 4.5 or any eariler kernel. Driver seems to use
the vlv_*_backlight() functions.
The brightness range is: 0 - 7812.
Written to /sys/class/backlight/intel_backlight/brignness 0 and 7812 give
black, 1 and 4687 both give full brightness.</pre>
</div>
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