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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [i915] intel_backlight does not function - Lenovo X1 Yoga OLED"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97883#c17">Comment # 17</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [i915] intel_backlight does not function - Lenovo X1 Yoga OLED"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97883">bug 97883</a>
from <span class="vcard"><a class="email" href="mailto:dan@ified.ca" title="Dan Sanders <dan@ified.ca>"> <span class="fn">Dan Sanders</span></a>
</span></b>
<pre>I have re-tested with cod/tip/drm-intel-next/2017-09-30
(e18063e88bd579c479a2b45820be6c4625f841c3) from the kernel-ppa.
<span class="quote">> Maybe it has nothing to do, but just in case, have you tried the
> "acpi_backlight=vendor" method?</span >
Yes, I have tested this. It does not help.
<span class="quote">> What's under /sys/class/backlight/? Under each directory there, can you
> change backlight by echoing (as root) values between 0 and $(cat
> max_brightness) to the brightness sysfs attribute file?</span >
There is only intel_backlight (c.f. #8). intel_backlight has a max_brightness
(852), but changing brightness has no effect.
<span class="quote">> Hello Dan, any change on this?</span >
There is no change. Considering that Intel shipped a special release of their
Windows driver just for this laptop to fix brightness controls, I do not expect
to be surprised by a fix.</pre>
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