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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - [Backlight] Very slow response changing backlight on intel video"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72959">bug 72959</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>NOTOURBUG
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - [Backlight] Very slow response changing backlight on intel video"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72959#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - [Backlight] Very slow response changing backlight on intel video"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72959">bug 72959</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>It's yet another bug in the ACPI firmware. It has been decided that for Windows
8 machines that the ACPI layer is so typically buggy that the kernel will not
expose the advertised ACPI backlight routines. But prior to that using the ACPI
layer was the only universal way to control the backlight. (I have a few
machines on which the backlight is not controlled by Intel's PWM.) Suffice to
say, all I can other is the workaround, the root cause is elsewhere.</pre>
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