[PATCH] drm/amd: Only allow one entity to control ABM

[Mario Limonciello]

On 4/13/2024 03:51, Gergo Koteles wrote:
> Hi>
> 
>> ABM will reduce the backlight and compensate by adjusting brightness and contrast of the image. It has 5 levels: 0, 1, 2, 3, 4. 0 means off. 4 means maximum backlight reduction. IMO, 1 and 2 look okay. 3 and 4 can be quite impactful, both to power and visual fidelity.
> 
> I tried this with 6.9 and it looks weird with an OLED panel used with
> dark UI settings.
> The dark is no longer dark, everything is brighter.
> I turned this feature off with amdgpu.abmlevel=0.
> 
> Best regards,
> Gergo
> 

Would you mind filing a bug with the details please?  This was something 
that was actually explicitly checked against an OLED panel.  ABM 
shouldn't be applying to OLED today so this very likely points at a bug 
somewhere in the stack.