https://bugs.freedesktop.org/show_bug.cgi?id=104064

--- Comment #32 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to taijian from comment #29)
> 2) The inconsistend dpm behaviour between dc=1 and dc=0 is still a thing.
> force_atpx=1 plus dc=1 gives me wonderful dpm with the dGPU fully powering
> down between uses. force_atpx=1 plus dc=0 does not. No idea what's up with
> that.

The platform claims to have an eDP panel connected, apparently even in hybrid
graphics mode when it's not actually in use.  The non-DC code assumes that if
there is an eDP panel, it's always connected since it's a non-removable display
and it shouldn't be present if there isn't one.  Because the driver thinks a
display is connected, the dGPU is kept on.

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