Comment # 20
on bug 107045
from taijian@posteo.de
OK, here is a new twist: upon further investigating this, I came across some weird backlight behaviour that I originally reported here: https://gitlab.gnome.org/GNOME/gnome-settings-daemon/issues/53. 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?
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