[Bug 97883] [i915] intel_backlight does not function - Lenovo X1 Yoga OLED

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97883

--- Comment #26 from Marten van Kerkwijk <mhvk at astro.utoronto.ca> ---
Jani - just so we are sure not to give up hope unnecessarily: the display is
made by Samsung and the driver by intel; neither are the worst in terms of
open-sourcing drivers (nor is Lenovo in fact). So, are you sure the driver is
in fact proprietary, rather than this simply being an oversight? The fact that
even the windows machines initially couldn't change their brightness suggests
oversight/incompetence is not an implausible explanation. Also, since formally
there is no back light for OLED displays, it is not that strange to not think
of using the backlight API -- though I certainly would have thought it would be
very logical to re-purpose that!

p.s. If it helps to have someone outside to attempt to contact about this, I'd
gladly do it -- but it would almost certainly help to know where start! Likely,
the post to the Lenovo forum I just made [1] is not going to be much use... If
you have any specific person where an e-mail would help, just let me know.

[1]
https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X-1-Yoga-OLED-brightness-control-under-linux/td-p/3948282

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