https://bugzilla.kernel.org/show_bug.cgi?id=217026
Hans de Goede (jwrdego...@fedoraproject.org) changed:
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CC| |jwrdego...@fedoraproject.or
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--- Comment #3 from Hans de Goede (jwrdego...@fedoraproject.org) ---
Yes this has already been reported on the malinglist.
There unfortunately is a firmware bug on the Lenovo Legion models.
On models with the Nvidia WMI EC backlight interface, when the laptop is
configured in dynamic mux mode in the BIOS (1) the backlight should always be
controlled by the Nvidia WMI EC backlight interface. So in theory the kernel is
behaving as it should according to the documentation here.
But as you found out, some Legion models are not behaving as the Nvidia WMI
spec says they should behave. This is also why you needed the hack/script to
write brightness values to both backlight devices at the same time with older
kernels.
Daniel Dadap from Nvidia is looking into this, but I'm afraid that we don't
have a solution yet.
1) So that you can switch at runtime which GPU is connected to the builtin LCD
panel
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