I have no remembrance of having done anything but now my ubuntu 12.04 always boots with very low screen brightness. I can then adjust it with FN+Pos1. I have a Lenovo X220.
Neither xbacklight nor any setting in the system settings has any effect. I did read some recommendations about complicated python scripts.
But why? I did not change anything! Why is ubuntu broken?
/var/log/apt/history.log
, and also the output fromlshw -c display
to know something about your graphics hardware.