Permission denied changing /sys/class/backlight/intel_backlight/brightness

I am trying to follow this discussion to change screen brightness in

Got Permission denied when doing
$sudo echo 100 > /sys/class/backlight/intel_backlight/brightness

$cat /sys/class/backlight/intel_backlight/brightness

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echo 100 | sudo tee /sys/class/backlight/intel_backlight/brightness

See also:

systemctl cat systemd-backlight@.service
systemctl status systemd-backlight@backlight:intel_backlight.service
head -v -n -0 /var/lib/systemd/backlight/*
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Thank you for the quick reply.

It solved the Permission problem.

It works.

Can I further ask how to make the change permenant?

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