Mailinglist Archive: opensuse-bugs (6750 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=721739

https://bugzilla.novell.com/show_bug.cgi?id=721739#c5


--- Comment #5 from Thorsten W. Schmidt <thorsten@xxxxxxxxxxx> 2011-11-24 
20:12:39 UTC ---
/sys/class/backlight contains
acpi_video0
intel_backlight
samsung

values from intel_backlight
max_brightness 312
type raw
bl_power -130210976

vales from samsung
max_brightness 8
type platform
bl_power 0

values from acpi_video0
max_brightnes 7
type firmware
bl_power 0


with acpi_video0 I can set the brightness without any problems. But when I try
to set the brightness with samsung I get the following

echo X > brightness; cat actual_brightness
X==0 -> 0
X==1 -> 1
X==2 -> 8
X==3 -> 7
X==4 -> 4
X==5 -> 2
X==6 -> 7
X==7 -> 7
X==8 -> 2

The values I get seem to depend on the brightness I had when changing the
brightness. When setting the brightness to 0, 1 or 7 it will stay in this
level. All other values set the brightness for a fraction of a second and
change it then to a random(?) value.

If I set the value several times to the same level, then the brightness level
stays on the chosen level.
echo 5 > brightness; sleep 1; echo 5 > brightness; cat actual_brightness
5

But when doing the following the screen flickers between dark and bright with
about 10-15Hz
echo 4 > brightness; echo 4 > brightness

with intel_backlight I can set the maximum brightness. So when I set it to 150
instead of 312 I can use the hardware keys to change the brightness between 5%
and 50%
X==0 -> black screen
X==1,3,5,7,9,11,13,15,17,19 -> maximum brightness
X==2,4,6,8,10,12,14,16,18 -> brightness increases from about 0% to 10%
constantly
X==20 -> brightness about 10%
X==312 -> maximum brightness
between X==20 and X==312 the brightness increases constantly 

I hope this helps.

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