I just replaced the broken screen on my Thinkpad Edge 13". Now the brightness-adjustments via the FN keys don't work anymore (the brightness indicator bar goes from Low - Full, but nothing actually changes).
ls /sys/class/backlight/*/brightness /sys/class/backlight/intel_backlight/brightness /sys/class/backlight/thinkpad_screen/brightness
Both have very different values for max_brightness (7 (thinkpad) and 4422465 (intel), but nothing changes "echoing" a smaller.
What else can I try?