Hi,
after a little console hacking, i found the cause of my laptop (old lenovo laptop) brightness problem. There are two backlight interface control in /sys:
ls /sys/class/backlight/
ideapad
intel_backlight
have tried to echo 7 > brightness, the one works is ideapad. but intel_backlight only give max_brightness to 1. And... the system use it as backlight control. Is there any to disable intel_backlight, or maybe force using ideapad??
Thanks
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