[Bug 207833] Brightness control not working on ASUS TUF FA506IU (AMD Ryzen 7 4800H / Nvidia GTX 1660 Ti)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207833

Antony J.R (antonyjr000 at gmail.com) changed:

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                 CC|                            |antonyjr000 at gmail.com

--- Comment #4 from Antony J.R (antonyjr000 at gmail.com) ---
(In reply to Alex Deucher from comment #3)
> Fixed with this patch:
> https://patchwork.freedesktop.org/patch/367486/

Does not work now in Linux kernel version 5.11-rc6(which is the latest mainline
kernel at the time of writing).

I got similar spec laptop(Lenovo Legion 5) with AMD Ryzen 7 4800H with Radeon
Grpahics and NVIDIA GTX 1650 Ti dGPU.

When using amdgpu kernel driver, the backlight is registered at
/sys/class/backlight/amdgpu_bl0

Now the problem is /sys/class/backlight/amdgpu_bl0/actual_brightness is stuck
at 311 and brightness control does not work at all.

I've tried a lot of workaround and even booted with the mainline kernel but
brightness control does not work. 

Only Fedora Workstation 32 with Linux kernel 5.6.6 has brightness control
working for AMD Ryzen 7 4800H APU which has the Renoir Graphics.

I have no idea why amd guys would break a already fixed issue in kernel 5.6.6,
I've tried all versions of the kernel but none works other than Fedora
Workstation 32 with Linux Kernel 5.6.6

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