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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [Baytrail-M] brightness can't be adjusted: no ASLE interrupt code"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73252#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [Baytrail-M] brightness can't be adjusted: no ASLE interrupt code"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73252">bug 73252</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>Afaik we need this at least on some machines since the ACPI backlight uses
OpRegion request to adjust the real hw backlight. So the flow on these machines
is:
1. button press
2. ACPI button converted to input key event
3. Userspace calculates new backlight and frobs the ACPI backlight
4. ACPI stores request value in OpRegion and generates the special OpRegeion
interrupt.
5. drm/i915 updates the backlight.
6. User is happy
Do not ask, won't tell.</pre>
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