[Bug 90151] Laptop Backlight Issue with Hybrid Graphics System

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90151

--- Comment #1 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Kevin Sarendranath from comment #0)
> 
> Is this an issue within the driver or from Lenovo's acpi implementation?
> 

Please attach your xorg log and dmesg output.

> If anything, I can control the backlight by using the /sys/ subsystem so I
> can remap the hotkeys to control the brightness while systemd will store it
> on reboot. In essence, I just wanted to bring this to attention due to the
> comment in the source.
> 
> Also a quick question on hybrid graphics, the radeon feature matrix states
> that Enduro is mostly complete and I believe that this lenovo system is
> muxless. Checking vgaswitcheroo, the integrated card is used while the
> discrete card is "DynOff" which I presume is dynamically off. Does that mean
> the driver is currently powering on the discrete card when rendering is
> required? Or is something else required?

By default the dGPU is powered off.  It's powered on dynamically when you want
to use it for rendering.  See:
https://wiki.archlinux.org/index.php/PRIME

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