[Bug 107045] [4.18rc2] RX470 dGPU on hybrid laptop freezes screen after use
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Aug 28 22:14:39 UTC 2018
https://bugs.freedesktop.org/show_bug.cgi?id=107045
--- Comment #21 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to taijian from comment #20)
> 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?
What do you mean by 'wake' the dGPU? This should be a separate ticket which you
can submit here + attach dmesg after this 'wake'.
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