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#1 2022-05-15 14:12:37

Pruple
Member
Registered: 2022-05-15
Posts: 2

changing the backlight brightness doesnt afffect the actual brightness

Any atempt to change the brightness fails. Using the GNOME UI or the FN keys will update data in /sys/class/backlight/amdgpu_bl0/brightness but the actual brightness of the screen will always be 100%

Device
Lenovo IdeaPad Gaming 3 15ARH05

System specs
CPU: AMD Ryzen 5 4600H with Radeon Graphics (12)
GPU: AMD ATI 05:00.0 Renoir
GPU: NVIDIA GeForce GTX 1650 Ti Mobile

Aditional data
/sys/class/backlight/amdgpu_bl0/max_brightness => 255

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#2 2022-05-16 04:06:26

skylize
Member
Registered: 2022-04-04
Posts: 12

Re: changing the backlight brightness doesnt afffect the actual brightness

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#3 2022-05-16 09:24:07

Pruple
Member
Registered: 2022-05-15
Posts: 2

Re: changing the backlight brightness doesnt afffect the actual brightness

I have tryed already all 4 parameters and none of them worked

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#4 2022-06-20 09:25:51

rep_movsd
Member
Registered: 2013-08-24
Posts: 115

Re: changing the backlight brightness doesnt afffect the actual brightness

I am experiencing the same on my Dell M7760

I am using xrandr like the following to control it:

xrandr --output DP-4 --brightness .5

For the stock Ubuntu that came on this system the brightness keys seemed to work. I am going to try making a separate Ubuntu install to check how that works

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