Re: brightness on lenovo ideapad

[Adrian Sevcenco]

On 5/6/20 8:03 PM, Sérgio Basto wrote:
>  On Wed, 2020-05-06 at 15:56 +0300, Adrian Sevcenco wrote:
> > On 5/5/20 8:47 PM, Sérgio Basto wrote:
> >> On Mon, 2020-05-04 at 13:05 +0300, Adrian Sevcenco wrote:
> >>> Hi! I post here as i suspect that it is a kde problem with
> >>> brightness
> >>> settings:
> >>> while the keyboard special functions modify the setting in the
> >>> Battery and Brightness tray module,
> >>> the actual brightness is not modified, but i actually can modify
> >>> the
> >>> brightness using xrandr.
> >>> Does anyone have any idea why the kde module does not use the
> >>> xrandr
> >>> mechanism?
> >>
> >> Power manager and "Display and Monitor" , what Fedora version are
> >> youusing ?
> > f31 updated
>  
>  I have IdeaPad L340 Gamming with f31 updated , and brightness works at
>  all places as expected 
This is an C340 with Ryzen 7 3700U and i have:
[root@c340sev ~]# ls /sys/class/backlight/
amdgpu_bl0  ideapad

but the problem does not seem to be from the hardware support as xrandr 
brightness setting works, but the inability of kde power/battery widget 
to control it ...

Beside digging in code, does anyone know how the plasma widget try to 
control de brightness?

Thank you!
Adrian