[Bug 203905] amdgpu:actual_brightness has unreal/wrong value

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203905

Kunal Bhat (kunal.bhat2001 at gmail.com) changed:

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--- Comment #9 from Kunal Bhat (kunal.bhat2001 at gmail.com) ---
(In reply to Flo Bock from comment #8)
> With recent systemd changes, the 16 bit values in actual_brightness break
> saving and restoring the backlight values using AMDGPU. According to a
> closed issue on Github, Lennart Poettering sees this as a kernel issue[1].
> Is there any good reason for actual_brightness to be 16bit, whereas both
> max_brightness and brightness are 8bit?
> 
> [1]: https://github.com/systemd/systemd/issues/16600



I believe it's there to provide a higher range of precision for the backlight.
Not sure why they never extended the range for max_brightness. 

The systemd devs are adamant that this is a driver issue, and aren't ready to
implement a work around for it. 
I believe this is the open issue with the discussions right now:
https://github.com/systemd/systemd/issues/16630

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