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After some painstaking debugging .
I finally KDE to work in MsHybrid mode. The issue was just that it starts at 0% brightness which corresponds to a black screen.
The brightness function keys work and modify the /sys/class/backlight/intel_backlight0/ variables correctly.
However the brightness of the display is either completely off at 0% or fully on for everything else.
I have tried acpi_backlight=video/vendor kernel parameters but it was the same deal for acpi_video as intel_backlight.
The variables change correctly the screen doesn't
Currently using nvidia-dkms, xf86-video-intel drivers with bumblebee.
Brightness controls worked with the nvidia drivers and the discreet card before [Optimus disabled]
(even though there was some funky buisness with the fn keys first decreasing screen brightness before increasing, which creating unpleasent flickers)
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setpci -s 00:02.0 F5.B=0 didn't work either.
I am truly lost here. None of the methods in the wiki work.
It was working fine when running discrete only.
Sysfs gets modified correctly but nothing ever changes (exept at 0%).
I'm thinking of installing arch from scratch again at this point.
Can you install arch while optimus is enabled?
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