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<body><span class="vcard"><a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> <span class="fn">XiongZhang</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight does not change when adjust it higher than 50% after S3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97486">bug 97486</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">i915 platform</td>
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<td>KBL
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight does not change when adjust it higher than 50% after S3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97486#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight does not change when adjust it higher than 50% after S3"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97486">bug 97486</a>
from <span class="vcard"><a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> <span class="fn">XiongZhang</span></a>
</span></b>
<pre>From ODM's debug result, the root cause of the issue is PWM signal is changed
after suspend and resume in Linux no mater which panel is used. However BOE's
panel spec does not support well when PWM signal is 1.6K.
Why PWM signal is changed to 1.6K after suspend and resume?
=================================
In Ubuntu Environment:
1. When system boot up to the desktop, PWM signal is 220K
2. After system suspend and resume, PWM signal is 1.6K
In WIndows 10 Environment:
1. When system boot up to the desktop, PWM signal is 220K
2. After system suspend and resume, PWM signal is 220K
===================================</pre>
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