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<body><span class="vcard"><a class="email" href="mailto:jre.winesim@gmail.com" title="jre.winesim@gmail.com">jre.winesim@gmail.com</a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87286">bug 87286</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>NEW
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87286#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87286">bug 87286</a>
from <span class="vcard"><a class="email" href="mailto:jre.winesim@gmail.com" title="jre.winesim@gmail.com">jre.winesim@gmail.com</a>
</span></b>
<pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=87286#c5">comment #5</a>)
<span class="quote">> If you boot without HDMI, ensure backlight control works, then hotplug HDMI,
> does the backlight control cease to work?</span >
Yes, without it works, after hotpluging it stops working.
<span class="quote">> Vice versa, if you boot with HDMI, confirm the bug is present, then unplug
> HDMI ,does the problem go away?</span >
No, it doesn't work even after unpluging.
Just to clarify: with "does not work" I mean the backlight control OSD bar
moves, but only between 0 and about 5%. This has no practical effect
(especially not if the screen is dimmed to complete black as it was with kernel
3.16).
I successfully tested the attached patch which fixes the issue by disabling the
native backlight (based upon a patch by Aaron Lu for a similar bug (84561) for
*another* product).
I can't judge if this is sufficient, or if we should try to fix
intel_backlight. For the latter I'll also include the output of acpidump.
Thanks again
Jens Reyer</pre>
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