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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [dual-gpu regression] Display shuts off when switching to discrete graphics card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59785#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [dual-gpu regression] Display shuts off when switching to discrete graphics card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59785">bug 59785</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>Well, we do shut down the backlight when disabling the LVDS output, at least
the intel backlight. To confirm that theory, can you please list all the
backlight controllers you have in /sys/class/backlight and which ones are
affecting your screen brightness? Please check both when the intel and when the
radeon gpu is enabled with the mux.</pre>
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