https://bugzilla.novell.com/show_bug.cgi?id=847869
https://bugzilla.novell.com/show_bug.cgi?id=847869#c3
--- Comment #3 from Antonio Larrosa 2013-11-04 15:53:51 UTC ---
I have the same problem in a Lenovo x230.
# echo 0 > /sys/class/backlight/intel_backlight/brightness
Press Bright-Up 4 times:
# cat /sys/class/backlight/intel_backlight/actual_brightness
0
Press Bright-Up 1 more time:
# cat /sys/class/backlight/intel_backlight/actual_brightness
68
Press Bright-Up 4 times:
# cat /sys/class/backlight/intel_backlight/actual_brightness
68
Press Bright-Up 1 more time:
# cat /sys/class/backlight/intel_backlight/actual_brightness
136
Press Bright-Up 9 times:
# cat /sys/class/backlight/intel_backlight/actual_brightness
136
Press Bright-Up 1 more time:
# cat /sys/class/backlight/intel_backlight/actual_brightness
204
Press Bright-Up 5 times (no change in the 4 previous presses)
# cat /sys/class/backlight/intel_backlight/actual_brightness
323
Press Bright-Up 5 times (no change in the 4 previous presses)
# cat /sys/class/backlight/intel_backlight/actual_brightness
425
And so on, with 5 presses each time until reaching 1921
Then it needs 10 presses to go to the next level: 2363
other 10 presses to go directly to 3060
and other 10 presses to go directly to 4335
and there's no way to go higher than that, despite the maximum being:
# cat /sys/class/backlight/intel_backlight/max_brightness
4437
Actually, doing: echo 4437 > cat
/sys/class/backlight/intel_backlight/brightness sets the brightness value to
4437, but it seems it doesn't change the actual screen brightness.
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