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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [4.18rc2] RX470 dGPU on hybrid laptop freezes screen after use"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107045#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [4.18rc2] RX470 dGPU on hybrid laptop freezes screen after use"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107045">bug 107045</a>
from <span class="vcard"><a class="email" href="mailto:taijian@posteo.de" title="taijian@posteo.de">taijian@posteo.de</a>
</span></b>
<pre>OK, here is a new twist: upon further investigating this, I came across some
weird backlight behaviour that I originally reported here:
<a href="https://gitlab.gnome.org/GNOME/gnome-settings-daemon/issues/53">https://gitlab.gnome.org/GNOME/gnome-settings-daemon/issues/53</a>. However, as it
turns out, this is not a gnome issue but a kernel one.
Namely, doing
echo X > /sys/class/backlight/intel_backlight/brightness
will wake my dGPU, even though it really shouldn't be involved at all (and does
not have a /sys/class/backlight device registered). Furthermore, repeatedly
invoking this command before the dGPU has had the chance to go back to sleep
will not do anything. Thirdly, this seems to be a very good way to get the
system to hard lock up.
So, is this an amdgpu issue? A i915 issue? ACPI? where should I take this bug
report?</pre>
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