Ninja-mania via qubes-users:
Thanks man,
Had some temporary success.
So this went well for my Qubes 4.0
cd /sys/class/backlight
ls
cd intel_backlight
sudo su
echo 80 > brightness
Then it goes rather quite dark, seemingly regardless of the number I select.
And once I change it, changing it again using the echo doesn’t work.
Also, how would you make it permanent? After sleep mode and restarts max
brightness returns.
Check "cat /sys/class/backlight/intel_backlight/max_brightness", your
range of allowed values might be different than mine.
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