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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HSW ULT] eDP backlight regression at 1920x1080"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68355#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HSW ULT] eDP backlight regression at 1920x1080"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68355">bug 68355</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>(In reply to <a href="show_bug.cgi?id=68355#c4">comment #4</a>)
<span class="quote">> On rc6 without acpi_backlight=vendor, the backlight won't come on at all at
> 1920x1080, but it will at lesser resolutions. It won't even respond to my
> switching resolutions "trick".</span >
Sounds like we're dealing with a tricky timing issue. The bisect result would
help a lot I hope. Can you please try to bisect where exactly the regression
has been introduced between -rc1 and -rc2?
See <a href="https://wiki.ubuntu.com/Kernel/KernelBisection">https://wiki.ubuntu.com/Kernel/KernelBisection</a> section "How do I bisect the
upstream kernel?" for a howto.</pre>
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