Mailinglist Archive: opensuse-bugs (5295 mails)

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[Bug 847869] Backlight is not workling properly

https://bugzilla.novell.com/show_bug.cgi?id=847869

https://bugzilla.novell.com/show_bug.cgi?id=847869#c3


--- Comment #3 from Antonio Larrosa <alarrosa@xxxxxxxx> 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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